21010915665088 has 28 divisors (see below), whose sum is σ = 41694501723352. Its totient is φ = 10505214443520.

The previous prime is 21010915665073. The next prime is 21010915665097. The reversal of 21010915665088 is 88056651901012.

It is a happy 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, 1002945 + ... + 6559552.

Almost surely, 2^{21010915665088} is an apocalyptic number.

It is an amenable number.

21010915665088 is a deficient number, since it is larger than the sum of its proper divisors (20683586058264).

21010915665088 is an equidigital number, since it uses as much as digits as its factorization.

21010915665088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7605920 (or 7605910 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 52.

The spelling of 21010915665088 in words is "twenty-one trillion, ten billion, nine hundred fifteen million, six hundred sixty-five thousand, eighty-eight".