21693543608 has 32 divisors (see below), whose sum is σ = 44722575360. Its totient is φ = 9783053280.

The previous prime is 21693543577. The next prime is 21693543623. The reversal of 21693543608 is 80634539612.

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, 959366 + ... + 981717.

It is an arithmetic number, because the mean of its divisors is an integer number (1397580480).

Almost surely, 2^21693543608 is an apocalyptic number.

It is an amenable number.

21693543608 is an abundant number, since it is smaller than the sum of its proper divisors (23029031752).

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

21693543608 is a wasteful number, since it uses less digits than its factorization.

21693543608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941227 (or 1941223 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 21693543608 in words is "twenty-one billion, six hundred ninety-three million, five hundred forty-three thousand, six hundred eight".