21930544 has 20 divisors (see below), whose sum is σ = 44990424. Its totient is φ = 10320128.

The previous prime is 21930511. The next prime is 21930553. The reversal of 21930544 is 44503912.

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, 40042 + ... + 40585.

Almost surely, 2^21930544 is an apocalyptic number.

It is an amenable number.

21930544 is an abundant number, since it is smaller than the sum of its proper divisors (23059880).

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

21930544 is a wasteful number, since it uses less digits than its factorization.

21930544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80652 (or 80646 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 21930544 is about 4683.0058723004. The cubic root of 21930544 is about 279.9087457730.

The spelling of 21930544 in words is "twenty-one million, nine hundred thirty thousand, five hundred forty-four".