21677645432 has 16 divisors (see below), whose sum is σ = 40666070760. Its totient is φ = 10833359904.

The previous prime is 21677645417. The next prime is 21677645441. The reversal of 21677645432 is 23454677612.

It is a super-2 number, since 2×21677645432² (a number of 21 digits) contains 22 as substring.

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, 665963 + ... + 697754.

Almost surely, 2^21677645432 is an apocalyptic number.

It is an amenable number.

21677645432 is a deficient number, since it is larger than the sum of its proper divisors (18988425328).

21677645432 is a wasteful number, since it uses less digits than its factorization.

21677645432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365710 (or 1365706 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 47.

The spelling of 21677645432 in words is "twenty-one billion, six hundred seventy-seven million, six hundred forty-five thousand, four hundred thirty-two".