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21312213333320 = 23571326592201957
BaseRepresentation
bin1001101100010001000101…
…11001111011010101001000
32210110102112210100120112102
410312020202321323111020
510243134403103131240
6113154410131532532
74326520341226130
oct466104271732510
983412483316472
1021312213333320
116877505900328
12248254915a148
13bb796b7b7b10
145397338b7ac0
1526e5a611b815
hex136222e7b548

21312213333320 has 128 divisors (see below), whose sum is σ = 59040659462400. Its totient is φ = 6742424503296.

The previous prime is 21312213333317. The next prime is 21312213333353. The reversal of 21312213333320 is 2333331221312.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8577782 + ... + 10779738.

It is an arithmetic number, because the mean of its divisors is an integer number (461255152050).

Almost surely, 221312213333320 is an apocalyptic number.

21312213333320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21312213333320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29520329731200).

21312213333320 is an abundant number, since it is smaller than the sum of its proper divisors (37728446129080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21312213333320 is a wasteful number, since it uses less digits than its factorization.

21312213333320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204647 (or 2204643 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 29.

Adding to 21312213333320 its reverse (2333331221312), we get a palindrome (23645544554632).

The spelling of 21312213333320 in words is "twenty-one trillion, three hundred twelve billion, two hundred thirteen million, three hundred thirty-three thousand, three hundred twenty".

Divisors: 1 2 4 5 7 8 10 13 14 20 26 28 35 40 52 56 65 70 91 104 130 140 182 260 280 364 455 520 728 910 1820 2659 3640 5318 10636 13295 18613 21272 26590 34567 37226 53180 69134 74452 93065 106360 138268 148904 172835 186130 241969 276536 345670 372260 483938 691340 744520 967876 1209845 1382680 1935752 2201957 2419690 4403914 4839380 8807828 9678760 11009785 15413699 17615656 22019570 28625441 30827398 44039140 57250882 61654796 77068495 88078280 114501764 123309592 143127205 154136990 200378087 229003528 286254410 308273980 400756174 572508820 616547960 801512348 1001890435 1145017640 1603024696 2003780870 4007561740 5855003663 8015123480 11710007326 23420014652 29275018315 40985025641 46840029304 58550036630 76115047619 81970051282 117100073260 152230095238 163940102564 204925128205 234200146520 304460190476 327880205128 380575238095 409850256410 532805333333 608920380952 761150476190 819700512820 1065610666666 1522300952380 1639401025640 2131221333332 2664026666665 3044601904760 4262442666664 5328053333330 10656106666660 21312213333320