21501952 has 24 divisors (see below), whose sum is σ = 42997500. Its totient is φ = 10749952.

The previous prime is 21501943. The next prime is 21501967. The reversal of 21501952 is 25910512.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202 + ... + 7297.

Almost surely, 2^21501952 is an apocalyptic number.

It is an amenable number.

21501952 is a deficient number, since it is larger than the sum of its proper divisors (21495548).

21501952 is an equidigital number, since it uses as much as digits as its factorization.

21501952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10521 (or 10501 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 21501952 is about 4637.0197325437. The cubic root of 21501952 is about 278.0733033065.

The spelling of 21501952 in words is "twenty-one million, five hundred one thousand, nine hundred fifty-two".