21955044 has 12 divisors (see below), whose sum is σ = 51228464. Its totient is φ = 7318344.

The previous prime is 21955039. The next prime is 21955067. The reversal of 21955044 is 44055912.

It is a tau number, because it is divible by the number of its divisors (12).

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, 914782 + ... + 914805.

Almost surely, 2^21955044 is an apocalyptic number.

It is an amenable number.

21955044 is an abundant number, since it is smaller than the sum of its proper divisors (29273420).

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

21955044 is a wasteful number, since it uses less digits than its factorization.

21955044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829594 (or 1829592 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 21955044 is about 4685.6209833916. The cubic root of 21955044 is about 280.0129415787.

The spelling of 21955044 in words is "twenty-one million, nine hundred fifty-five thousand, forty-four".