21359732 has 12 divisors (see below), whose sum is σ = 39004896. Its totient is φ = 10215480.

The previous prime is 21359731. The next prime is 21359753. The reversal of 21359732 is 23795312.

It is a super-2 number, since 2×21359732² = 912476302223648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21359731) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 115994 + ... + 116177.

It is an arithmetic number, because the mean of its divisors is an integer number (3250408).

Almost surely, 2^21359732 is an apocalyptic number.

It is an amenable number.

21359732 is a deficient number, since it is larger than the sum of its proper divisors (17645164).

21359732 is a wasteful number, since it uses less digits than its factorization.

21359732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232198 (or 232196 counting only the distinct ones).

The product of its digits is 11340, while the sum is 32.

The square root of 21359732 is about 4621.6590094900. The cubic root of 21359732 is about 277.4588614178.

The spelling of 21359732 in words is "twenty-one million, three hundred fifty-nine thousand, seven hundred thirty-two".