21922975 has 12 divisors (see below), whose sum is σ = 27245776. Its totient is φ = 17498880.

The previous prime is 21922969. The next prime is 21922993. The reversal of 21922975 is 57922912.

It is not a de Polignac number, because 21922975 - 2⁷ = 21922847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 16174 + ... + 17476.

Almost surely, 2^21922975 is an apocalyptic number.

21922975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21922975 is a deficient number, since it is larger than the sum of its proper divisors (5322801).

21922975 is a wasteful number, since it uses less digits than its factorization.

21922975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986 (or 1981 counting only the distinct ones).

The product of its digits is 22680, while the sum is 37.

The square root of 21922975 is about 4682.1976677624. The cubic root of 21922975 is about 279.8765399587.

The spelling of 21922975 in words is "twenty-one million, nine hundred twenty-two thousand, nine hundred seventy-five".