21113164 has 6 divisors (see below), whose sum is σ = 36948044. Its totient is φ = 10556580.

The previous prime is 21113159. The next prime is 21113173. The reversal of 21113164 is 46131112.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639142 + ... + 2639149.

Almost surely, 2^21113164 is an apocalyptic number.

It is an amenable number.

21113164 is a deficient number, since it is larger than the sum of its proper divisors (15834880).

21113164 is a wasteful number, since it uses less digits than its factorization.

21113164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278295 (or 5278293 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 21113164 is about 4594.9063102527. The cubic root of 21113164 is about 276.3871029688.

Adding to 21113164 its reverse (46131112), we get a palindrome (67244276).

The spelling of 21113164 in words is "twenty-one million, one hundred thirteen thousand, one hundred sixty-four".