21938152 has 16 divisors (see below), whose sum is σ = 42552900. Its totient is φ = 10590720.

The previous prime is 21938149. The next prime is 21938167. The reversal of 21938152 is 25183912.

It can be written as a sum of positive squares in 2 ways, for example, as 21585316 + 352836 = 4646^2 + 594^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47049 + ... + 47512.

Almost surely, 2^21938152 is an apocalyptic number.

It is an amenable number.

21938152 is a deficient number, since it is larger than the sum of its proper divisors (20614748).

21938152 is a wasteful number, since it uses less digits than its factorization.

21938152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94596 (or 94592 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 21938152 is about 4683.8181006525. The cubic root of 21938152 is about 279.9411100640.

The spelling of 21938152 in words is "twenty-one million, nine hundred thirty-eight thousand, one hundred fifty-two".