21093444 has 36 divisors (see below), whose sum is σ = 54228720. Its totient is φ = 6911280.

The previous prime is 21093437. The next prime is 21093451. The reversal of 21093444 is 44439012.

21093444 is a `hidden beast` number, since 210 + 9 + 3 + 444 = 666.

It is an interprime number because it is at equal distance from previous prime (21093437) and next prime (21093451).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21093444² = 889866759562272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2842 + ... + 7089.

Almost surely, 2^21093444 is an apocalyptic number.

It is an amenable number.

21093444 is an abundant number, since it is smaller than the sum of its proper divisors (33135276).

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

21093444 is a wasteful number, since it uses less digits than its factorization.

21093444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10000 (or 9995 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21093444 is about 4592.7599545371. The cubic root of 21093444 is about 276.3010263161.

The spelling of 21093444 in words is "twenty-one million, ninety-three thousand, four hundred forty-four".