22521970 has 16 divisors (see below), whose sum is σ = 40613400. Its totient is φ = 8992384.

The previous prime is 22521931. The next prime is 22521971. The reversal of 22521970 is 7912522.

It can be written as a sum of positive squares in 4 ways, for example, as 7382089 + 15139881 = 2717^2 + 3891^2 .

It is not an unprimeable number, because it can be changed into a prime (22521971) 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 7 ways as a sum of consecutive naturals, for example, 4806 + ... + 8254.

Almost surely, 2^22521970 is an apocalyptic number.

22521970 is a deficient number, since it is larger than the sum of its proper divisors (18091430).

22521970 is a wasteful number, since it uses less digits than its factorization.

22521970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 22521970 is about 4745.7317665456. The cubic root of 22521970 is about 282.4026657133.

The spelling of 22521970 in words is "twenty-two million, five hundred twenty-one thousand, nine hundred seventy".