21525232 has 20 divisors (see below), whose sum is σ = 41788000. Its totient is φ = 10741248.

The previous prime is 21525227. The next prime is 21525277. The reversal of 21525232 is 23252512.

It is a super-2 number, since 2×21525232² = 926671225307648, 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9769 + ... + 11767.

It is an arithmetic number, because the mean of its divisors is an integer number (2089400).

Almost surely, 2^21525232 is an apocalyptic number.

It is an amenable number.

21525232 is a deficient number, since it is larger than the sum of its proper divisors (20262768).

21525232 is a wasteful number, since it uses less digits than its factorization.

21525232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680 (or 2674 counting only the distinct ones).

The product of its digits is 1200, while the sum is 22.

The square root of 21525232 is about 4639.5292864686. The cubic root of 21525232 is about 278.1736230607.

Adding to 21525232 its reverse (23252512), we get a palindrome (44777744).

The spelling of 21525232 in words is "twenty-one million, five hundred twenty-five thousand, two hundred thirty-two".