21632152 has 8 divisors (see below), whose sum is σ = 40560300. Its totient is φ = 10816072.

The previous prime is 21632137. The next prime is 21632179. The reversal of 21632152 is 25123612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21632152² = 935900000302208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1352002 + ... + 1352017.

Almost surely, 2^21632152 is an apocalyptic number.

It is an amenable number.

21632152 is a deficient number, since it is larger than the sum of its proper divisors (18928148).

21632152 is a wasteful number, since it uses less digits than its factorization.

21632152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704025 (or 2704021 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 21632152 is about 4651.0377336676. The cubic root of 21632152 is about 278.6334433300.

Adding to 21632152 its reverse (25123612), we get a palindrome (46755764).

The spelling of 21632152 in words is "twenty-one million, six hundred thirty-two thousand, one hundred fifty-two".