21020462528 has 56 divisors (see below), whose sum is σ = 46016844720. Its totient is φ = 9465108480.

The previous prime is 21020462509. The next prime is 21020462587. The reversal of 21020462528 is 82526402012.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 21020462494 and 21020462503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273998 + ... + 342221.

It is an arithmetic number, because the mean of its divisors is an integer number (821729370).

Almost surely, 2^21020462528 is an apocalyptic number.

It is an amenable number.

21020462528 is an abundant number, since it is smaller than the sum of its proper divisors (24996382192).

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

21020462528 is a wasteful number, since it uses less digits than its factorization.

21020462528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616285 (or 616275 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The spelling of 21020462528 in words is "twenty-one billion, twenty million, four hundred sixty-two thousand, five hundred twenty-eight".