21874668 has 24 divisors (see below), whose sum is σ = 51190272. Its totient is φ = 7270224.

The previous prime is 21874627. The next prime is 21874673. The reversal of 21874668 is 86647812.

It is a super-2 number, since 2×21874668² = 957002200220448, which contains 22 as substring.

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, 1921 + ... + 6887.

It is an arithmetic number, because the mean of its divisors is an integer number (2132928).

Almost surely, 2^21874668 is an apocalyptic number.

It is an amenable number.

21874668 is an abundant number, since it is smaller than the sum of its proper divisors (29315604).

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

21874668 is a wasteful number, since it uses less digits than its factorization.

21874668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5341 (or 5339 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 21874668 is about 4677.0362410398. The cubic root of 21874668 is about 279.6708206380.

The spelling of 21874668 in words is "twenty-one million, eight hundred seventy-four thousand, six hundred sixty-eight".