21632163 has 32 divisors (see below), whose sum is σ = 33985536. Its totient is φ = 11985408.

The previous prime is 21632137. The next prime is 21632179. The reversal of 21632163 is 36123612.

It is a happy number.

It is not a de Polignac number, because 21632163 - 2⁵ = 21632131 is a prime.

It is a super-4 number, since 4×21632163⁴ (a number of 30 digits) contains 4444 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21632113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157831 + ... + 157967.

It is an arithmetic number, because the mean of its divisors is an integer number (1062048).

Almost surely, 2^21632163 is an apocalyptic number.

21632163 is a deficient number, since it is larger than the sum of its proper divisors (12353373).

21632163 is a wasteful number, since it uses less digits than its factorization.

21632163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323.

The product of its digits is 1296, while the sum is 24.

The square root of 21632163 is about 4651.0389161993. The cubic root of 21632163 is about 278.6334905586.

Adding to 21632163 its reverse (36123612), we get a palindrome (57755775).

The spelling of 21632163 in words is "twenty-one million, six hundred thirty-two thousand, one hundred sixty-three".