21924955 has 32 divisors (see below), whose sum is σ = 30623040. Its totient is φ = 14929920.

The previous prime is 21924953. The next prime is 21924961. The reversal of 21924955 is 55942912.

It is not a de Polignac number, because 21924955 - 2¹ = 21924953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21924953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50419 + ... + 50851.

It is an arithmetic number, because the mean of its divisors is an integer number (956970).

Almost surely, 2^21924955 is an apocalyptic number.

21924955 is a deficient number, since it is larger than the sum of its proper divisors (8698085).

21924955 is a wasteful number, since it uses less digits than its factorization.

21924955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511.

The product of its digits is 32400, while the sum is 37.

The square root of 21924955 is about 4682.4091021610. The cubic root of 21924955 is about 279.8849655011.

The spelling of 21924955 in words is "twenty-one million, nine hundred twenty-four thousand, nine hundred fifty-five".