21275044 has 24 divisors (see below), whose sum is σ = 42977088. Its totient is φ = 9026400.

The previous prime is 21275039. The next prime is 21275053. The reversal of 21275044 is 44057212.

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, 934 + ... + 6589.

It is an arithmetic number, because the mean of its divisors is an integer number (1790712).

Almost surely, 2^21275044 is an apocalyptic number.

It is an amenable number.

21275044 is an abundant number, since it is smaller than the sum of its proper divisors (21702044).

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

21275044 is a wasteful number, since it uses less digits than its factorization.

21275044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7635 (or 7633 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 21275044 is about 4612.4878319623. The cubic root of 21275044 is about 277.0916820419.

The spelling of 21275044 in words is "twenty-one million, two hundred seventy-five thousand, forty-four".