21735164 has 24 divisors (see below), whose sum is σ = 43680000. Its totient is φ = 9359280.

The previous prime is 21735149. The next prime is 21735173. The reversal of 21735164 is 46153712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12164 + ... + 13835.

It is an arithmetic number, because the mean of its divisors is an integer number (1820000).

Almost surely, 2^21735164 is an apocalyptic number.

It is an amenable number.

21735164 is an abundant number, since it is smaller than the sum of its proper divisors (21944836).

21735164 is a wasteful number, since it uses less digits than its factorization.

21735164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26033 (or 26031 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 21735164 is about 4662.0986690545. The cubic root of 21735164 is about 279.0750259640.

Adding to 21735164 its reverse (46153712), we get a palindrome (67888876).

It can be divided in two parts, 2173 and 5164, that added together give a palindrome (7337).

The spelling of 21735164 in words is "twenty-one million, seven hundred thirty-five thousand, one hundred sixty-four".