21123952 has 10 divisors (see below), whose sum is σ = 40927688. Its totient is φ = 10561968.

The previous prime is 21123917. The next prime is 21123983. The reversal of 21123952 is 25932112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660108 + ... + 660139.

Almost surely, 2^21123952 is an apocalyptic number.

It is an amenable number.

21123952 is a deficient number, since it is larger than the sum of its proper divisors (19803736).

21123952 is a wasteful number, since it uses less digits than its factorization.

21123952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320255 (or 1320249 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 21123952 is about 4596.0800689283. The cubic root of 21123952 is about 276.4341692821.

The spelling of 21123952 in words is "twenty-one million, one hundred twenty-three thousand, nine hundred fifty-two".