21877432 has 16 divisors (see below), whose sum is σ = 41093640. Its totient is φ = 10919136.

The previous prime is 21877423. The next prime is 21877433. The reversal of 21877432 is 23477812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21877433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3018 + ... + 7270.

Almost surely, 2^21877432 is an apocalyptic number.

It is an amenable number.

21877432 is a deficient number, since it is larger than the sum of its proper divisors (19216208).

21877432 is a wasteful number, since it uses less digits than its factorization.

21877432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4902 (or 4898 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 21877432 is about 4677.3317179777. The cubic root of 21877432 is about 279.6825995230.

The spelling of 21877432 in words is "twenty-one million, eight hundred seventy-seven thousand, four hundred thirty-two".