21303164 has 6 divisors (see below), whose sum is σ = 37280544. Its totient is φ = 10651580.

The previous prime is 21303143. The next prime is 21303187. The reversal of 21303164 is 46130312.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2662892 + ... + 2662899.

It is an arithmetic number, because the mean of its divisors is an integer number (6213424).

Almost surely, 2^21303164 is an apocalyptic number.

It is an amenable number.

21303164 is a deficient number, since it is larger than the sum of its proper divisors (15977380).

21303164 is a wasteful number, since it uses less digits than its factorization.

21303164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5325795 (or 5325793 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21303164 is about 4615.5350719066. The cubic root of 21303164 is about 277.2137090157.

Adding to 21303164 its reverse (46130312), we get a palindrome (67433476).

The spelling of 21303164 in words is "twenty-one million, three hundred three thousand, one hundred sixty-four".