21255542032 has 20 divisors (see below), whose sum is σ = 41797280656. Its totient is φ = 10469147040.

The previous prime is 21255542027. The next prime is 21255542089. The reversal of 21255542032 is 23024555212.

It is a junction number, because it is equal to n+sod(n) for n = 21255541985 and 21255542003.

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, 9912894 + ... + 9915037.

Almost surely, 2^21255542032 is an apocalyptic number.

It is an amenable number.

21255542032 is a deficient number, since it is larger than the sum of its proper divisors (20541738624).

21255542032 is a wasteful number, since it uses less digits than its factorization.

21255542032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19828006 (or 19828000 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 21255542032 in words is "twenty-one billion, two hundred fifty-five million, five hundred forty-two thousand, thirty-two".