21532174520 has 16 divisors (see below), whose sum is σ = 48447392760. Its totient is φ = 8612869792.

The previous prime is 21532174519. The next prime is 21532174537. The reversal of 21532174520 is 2547123512.

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, 269152142 + ... + 269152221.

Almost surely, 2^21532174520 is an apocalyptic number.

21532174520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21532174520 is an abundant number, since it is smaller than the sum of its proper divisors (26915218240).

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

21532174520 is a wasteful number, since it uses less digits than its factorization.

21532174520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538304374 (or 538304370 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The spelling of 21532174520 in words is "twenty-one billion, five hundred thirty-two million, one hundred seventy-four thousand, five hundred twenty".