21225938 has 16 divisors (see below), whose sum is σ = 32829720. Its totient is φ = 10285056.

The previous prime is 21225881. The next prime is 21225943. The reversal of 21225938 is 83952212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20403289 + 822649 = 4517^2 + 907^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27218 + ... + 27986.

Almost surely, 2^21225938 is an apocalyptic number.

21225938 is a deficient number, since it is larger than the sum of its proper divisors (11603782).

21225938 is a wasteful number, since it uses less digits than its factorization.

21225938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181.

The product of its digits is 8640, while the sum is 32.

The square root of 21225938 is about 4607.1615990759. The cubic root of 21225938 is about 276.8783280534.

The spelling of 21225938 in words is "twenty-one million, two hundred twenty-five thousand, nine hundred thirty-eight".