21752032 has 12 divisors (see below), whose sum is σ = 42824376. Its totient is φ = 10876000.

The previous prime is 21752021. The next prime is 21752039. The reversal of 21752032 is 23025712.

It is a super-2 number, since 2×21752032² = 946301792258048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21751994 and 21752012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21752039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339844 + ... + 339907.

It is an arithmetic number, because the mean of its divisors is an integer number (3568698).

Almost surely, 2^21752032 is an apocalyptic number.

It is an amenable number.

21752032 is a deficient number, since it is larger than the sum of its proper divisors (21072344).

21752032 is an equidigital number, since it uses as much as digits as its factorization.

21752032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679761 (or 679753 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21752032 is about 4663.9073747235. The cubic root of 21752032 is about 279.1472011773.

Adding to 21752032 its reverse (23025712), we get a palindrome (44777744).

The spelling of 21752032 in words is "twenty-one million, seven hundred fifty-two thousand, thirty-two".