21525170528 has 48 divisors (see below), whose sum is σ = 45339441840. Its totient is φ = 10028966400.

The previous prime is 21525170501. The next prime is 21525170531. The reversal of 21525170528 is 82507152512.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 21525170491 and 21525170500.

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, 253103 + ... + 327278.

It is an arithmetic number, because the mean of its divisors is an integer number (944571705).

Almost surely, 2^21525170528 is an apocalyptic number.

It is an amenable number.

21525170528 is an abundant number, since it is smaller than the sum of its proper divisors (23814271312).

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

21525170528 is a wasteful number, since it uses less digits than its factorization.

21525170528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580471 (or 580463 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 38.

The spelling of 21525170528 in words is "twenty-one billion, five hundred twenty-five million, one hundred seventy thousand, five hundred twenty-eight".