21353164 has 24 divisors (see below), whose sum is σ = 44180640. Its totient is φ = 8835456.

The previous prime is 21353159. The next prime is 21353191. The reversal of 21353164 is 46135312.

It is a super-2 number, since 2×21353164² = 911915225621792, which contains 22 as substring.

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, 12337 + ... + 13960.

It is an arithmetic number, because the mean of its divisors is an integer number (1840860).

Almost surely, 2^21353164 is an apocalyptic number.

It is an amenable number.

21353164 is an abundant number, since it is smaller than the sum of its proper divisors (22827476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21353164 is a wasteful number, since it uses less digits than its factorization.

21353164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26337 (or 26335 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 21353164 is about 4620.9483875066. The cubic root of 21353164 is about 277.4304194782.

Adding to 21353164 its reverse (46135312), we get a palindrome (67488476).

The spelling of 21353164 in words is "twenty-one million, three hundred fifty-three thousand, one hundred sixty-four".