21874056 has 16 divisors (see below), whose sum is σ = 54685200. Its totient is φ = 7291344.

The previous prime is 21874049. The next prime is 21874063. The reversal of 21874056 is 65047812.

It is an interprime number because it is at equal distance from previous prime (21874049) and next prime (21874063).

It is a super-2 number, since 2×21874056² = 956948651782272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455686 + ... + 455733.

It is an arithmetic number, because the mean of its divisors is an integer number (3417825).

Almost surely, 2^21874056 is an apocalyptic number.

It is an amenable number.

21874056 is an abundant number, since it is smaller than the sum of its proper divisors (32811144).

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

21874056 is a wasteful number, since it uses less digits than its factorization.

21874056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911428 (or 911424 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 21874056 is about 4676.9708145337. The cubic root of 21874056 is about 279.6682124440.

The spelling of 21874056 in words is "twenty-one million, eight hundred seventy-four thousand, fifty-six".