21655052 has 24 divisors (see below), whose sum is σ = 40515552. Its totient is φ = 10102400.

The previous prime is 21655043. The next prime is 21655063. The reversal of 21655052 is 25055612.

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 7 ways as a sum of consecutive naturals, for example, 902 + ... + 6642.

It is an arithmetic number, because the mean of its divisors is an integer number (1688148).

Almost surely, 2^21655052 is an apocalyptic number.

It is an amenable number.

21655052 is a deficient number, since it is larger than the sum of its proper divisors (18860500).

21655052 is a wasteful number, since it uses less digits than its factorization.

21655052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5809 (or 5807 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 21655052 is about 4653.4988986783. The cubic root of 21655052 is about 278.7317299856.

The spelling of 21655052 in words is "twenty-one million, six hundred fifty-five thousand, fifty-two".