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21009666888108 = 22321779014344959
BaseRepresentation
bin1001100011011101100011…
…01110110101000110101100
32202101111121210211201122200
410301232301232311012230
510223210244210404413
6112403412511341500
74265620062664113
oct461566156650654
982344553751580
1021009666888108
116770171268058
122433992b21890
13b952842476c2
14528c324b4c7a
1526679a10a573
hex131bb1bb51ac

21009666888108 has 72 divisors (see below), whose sum is σ = 56238885480960. Its totient is φ = 6590432294400.

The previous prime is 21009666888107. The next prime is 21009666888137. The reversal of 21009666888108 is 80188866690012.

It is a super-2 number, since 2×210096668881082 (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21009666888107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2662933 + ... + 7007891.

It is an arithmetic number, because the mean of its divisors is an integer number (781095631680).

Almost surely, 221009666888108 is an apocalyptic number.

It is an amenable number.

21009666888108 is an abundant number, since it is smaller than the sum of its proper divisors (35229218592852).

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

21009666888108 is a wasteful number, since it uses less digits than its factorization.

21009666888108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4352887 (or 4352882 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 63.

The spelling of 21009666888108 in words is "twenty-one trillion, nine billion, six hundred sixty-six million, eight hundred eighty-eight thousand, one hundred eight".

Divisors: 1 2 3 4 6 9 12 17 18 34 36 51 68 102 153 204 306 612 7901 15802 23703 31604 47406 71109 94812 134317 142218 268634 284436 402951 537268 805902 1208853 1611804 2417706 4344959 4835412 8689918 13034877 17379836 26069754 39104631 52139508 73864303 78209262 147728606 156418524 221592909 295457212 443185818 664778727 886371636 1329557454 2659114908 34329521059 68659042118 102988563177 137318084236 205977126354 308965689531 411954252708 583601858003 617931379062 1167203716006 1235862758124 1750805574009 2334407432012 3501611148018 5252416722027 7003222296036 10504833444054 21009666888108