21752152 has 32 divisors (see below), whose sum is σ = 42886800. Its totient is φ = 10329984.

The previous prime is 21752141. The next prime is 21752177. The reversal of 21752152 is 25125712.

It is a super-2 number, since 2×21752152² = 946312233262208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 11874 + ... + 13582.

Almost surely, 2^21752152 is an apocalyptic number.

It is an amenable number.

21752152 is a deficient number, since it is larger than the sum of its proper divisors (21134648).

21752152 is a wasteful number, since it uses less digits than its factorization.

21752152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795 (or 1791 counting only the distinct ones).

The product of its digits is 1400, while the sum is 25.

The square root of 21752152 is about 4663.9202394552. The cubic root of 21752152 is about 279.1477145026.

Adding to 21752152 its reverse (25125712), we get a palindrome (46877864).

It can be divided in two parts, 21752 and 152, that added together give a square (21904 = 148²).

The spelling of 21752152 in words is "twenty-one million, seven hundred fifty-two thousand, one hundred fifty-two".