21459737653668 has 96 divisors (see below), whose sum is σ = 57620393349120. Its totient is φ = 6902442721440.

The previous prime is 21459737653589. The next prime is 21459737653681. The reversal of 21459737653668 is 86635673795412.

It is a happy number.

21459737653668 is a `hidden beast` number, since 2 + 1 + 4 + 59 + 7 + 37 + 6 + 536 + 6 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21459737653596 and 21459737653605.

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, 29412046 + ... + 30132837.

It is an arithmetic number, because the mean of its divisors is an integer number (600212430720).

Almost surely, 2^{21459737653668} is an apocalyptic number.

It is an amenable number.

21459737653668 is an abundant number, since it is smaller than the sum of its proper divisors (36160655695452).

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

21459737653668 is a wasteful number, since it uses less digits than its factorization.

21459737653668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59545014 (or 59545006 counting only the distinct ones).

The product of its digits is 1371686400, while the sum is 72.

The spelling of 21459737653668 in words is "twenty-one trillion, four hundred fifty-nine billion, seven hundred thirty-seven million, six hundred fifty-three thousand, six hundred sixty-eight".