21889464 has 16 divisors (see below), whose sum is σ = 54723720. Its totient is φ = 7296480.

The previous prime is 21889453. The next prime is 21889487. The reversal of 21889464 is 46498812.

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, 456007 + ... + 456054.

Almost surely, 2^21889464 is an apocalyptic number.

21889464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21889464 is an abundant number, since it is smaller than the sum of its proper divisors (32834256).

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

21889464 is a wasteful number, since it uses less digits than its factorization.

21889464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912070 (or 912066 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 21889464 is about 4678.6177445908. The cubic root of 21889464 is about 279.7338627656.

The spelling of 21889464 in words is "twenty-one million, eight hundred eighty-nine thousand, four hundred sixty-four".