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202121202220 = 225741223915727
BaseRepresentation
bin1011110000111101011…
…1001100101000101100
3201022201011200220220121
42330033113030220230
511302421011432340
6232504142454324
720413515605020
oct2741727145054
9638634626817
10202121202220
11787a0170893
1233209b943a4
13160a1921712
149ad5aca380
1553ce7c894a
hex2f0f5cca2c

202121202220 has 96 divisors (see below), whose sum is σ = 497175920640. Its totient is φ = 67573992960.

The previous prime is 202121202197. The next prime is 202121202259. The reversal of 202121202220 is 22202121202.

It is a junction number, because it is equal to n+sod(n) for n = 202121202194 and 202121202203.

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, 12843997 + ... + 12859723.

It is an arithmetic number, because the mean of its divisors is an integer number (5178915840).

Almost surely, 2202121202220 is an apocalyptic number.

202121202220 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 202121202220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248587960320).

202121202220 is an abundant number, since it is smaller than the sum of its proper divisors (295054718420).

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

202121202220 is a wasteful number, since it uses less digits than its factorization.

202121202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18023 (or 18021 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 202121202220 its reverse (22202121202), we get a palindrome (224323323422).

The spelling of 202121202220 in words is "two hundred two billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty".

Divisors: 1 2 4 5 7 10 14 20 28 35 41 70 82 140 164 205 287 410 574 820 1148 1435 2239 2870 4478 5740 8956 11195 15673 15727 22390 31346 31454 44780 62692 62908 78365 78635 91799 110089 156730 157270 183598 220178 313460 314540 367196 440356 458995 550445 642593 644807 917990 1100890 1285186 1289614 1835980 2201780 2570372 2579228 3212965 3224035 4513649 6425930 6448070 9027298 12851860 12896140 18054596 22568245 35212753 45136490 70425506 90272980 140851012 176063765 246489271 352127530 492978542 704255060 985957084 1232446355 1443722873 2464892710 2887445746 4929785420 5774891492 7218614365 10106060111 14437228730 20212120222 28874457460 40424240444 50530300555 101060601110 202121202220