21679464 has 16 divisors (see below), whose sum is σ = 54198720. Its totient is φ = 7226480.

The previous prime is 21679459. The next prime is 21679477. The reversal of 21679464 is 46497612.

It is a happy 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, 451632 + ... + 451679.

It is an arithmetic number, because the mean of its divisors is an integer number (3387420).

Almost surely, 2^21679464 is an apocalyptic number.

21679464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21679464 is an abundant number, since it is smaller than the sum of its proper divisors (32519256).

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

21679464 is a wasteful number, since it uses less digits than its factorization.

21679464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903320 (or 903316 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 21679464 is about 4656.1211324449. The cubic root of 21679464 is about 278.8364298604.

The spelling of 21679464 in words is "twenty-one million, six hundred seventy-nine thousand, four hundred sixty-four".