21152332 has 6 divisors (see below), whose sum is σ = 37016588. Its totient is φ = 10576164.

The previous prime is 21152321. The next prime is 21152333. The reversal of 21152332 is 23325112.

It is a super-2 number, since 2×21152332² = 894842298076448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21152333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2644038 + ... + 2644045.

It is a self-describing number.

Almost surely, 2^21152332 is an apocalyptic number.

It is an amenable number.

21152332 is a deficient number, since it is larger than the sum of its proper divisors (15864256).

21152332 is a wasteful number, since it uses less digits than its factorization.

21152332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5288087 (or 5288085 counting only the distinct ones).

The product of its digits is 360, while the sum is 19.

The square root of 21152332 is about 4599.1664462161. The cubic root of 21152332 is about 276.5579101901.

Adding to 21152332 its reverse (23325112), we get a palindrome (44477444).

The spelling of 21152332 in words is "twenty-one million, one hundred fifty-two thousand, three hundred thirty-two".