21028232512 has 56 divisors (see below), whose sum is σ = 48588875136. Its totient is φ = 8842050048.

The previous prime is 21028232453. The next prime is 21028232527. The reversal of 21028232512 is 21523282012.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419068 + ... + 466555.

Almost surely, 2^21028232512 is an apocalyptic number.

It is an amenable number.

21028232512 is an abundant number, since it is smaller than the sum of its proper divisors (27560642624).

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

21028232512 is an equidigital number, since it uses as much as digits as its factorization.

21028232512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885695 (or 885685 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 21028232512 in words is "twenty-one billion, twenty-eight million, two hundred thirty-two thousand, five hundred twelve".