21875922 has 12 divisors (see below), whose sum is σ = 47397870. Its totient is φ = 7291968.

The previous prime is 21875911. The next prime is 21875927. The reversal of 21875922 is 22957812.

It can be written as a sum of positive squares in only one way, i.e., 12383361 + 9492561 = 3519^2 + 3081^2 .

It is not an unprimeable number, because it can be changed into a prime (21875927) 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 5 ways as a sum of consecutive naturals, for example, 607647 + ... + 607682.

Almost surely, 2^21875922 is an apocalyptic number.

21875922 is an abundant number, since it is smaller than the sum of its proper divisors (25521948).

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

21875922 is a wasteful number, since it uses less digits than its factorization.

21875922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215337 (or 1215334 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 21875922 is about 4677.1702983749. The cubic root of 21875922 is about 279.6761647269.

The spelling of 21875922 in words is "twenty-one million, eight hundred seventy-five thousand, nine hundred twenty-two".