21351665034232 has 16 divisors (see below), whose sum is σ = 43113939011640. Its totient is φ = 9854614631136.

The previous prime is 21351665034229. The next prime is 21351665034247. The reversal of 21351665034232 is 23243056615312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102652235638 + ... + 102652235845.

Almost surely, 2^{21351665034232} is an apocalyptic number.

It is an amenable number.

21351665034232 is an abundant number, since it is smaller than the sum of its proper divisors (21762273977408).

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

21351665034232 is a wasteful number, since it uses less digits than its factorization.

21351665034232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205304471502 (or 205304471498 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 21351665034232 in words is "twenty-one trillion, three hundred fifty-one billion, six hundred sixty-five million, thirty-four thousand, two hundred thirty-two".