21492164 has 12 divisors (see below), whose sum is σ = 37653504. Its totient is φ = 10734024.

The previous prime is 21492157. The next prime is 21492167. The reversal of 21492164 is 46129412.

It is a super-2 number, since 2×21492164² = 923826226805792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21492167) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1877 + ... + 6819.

It is an arithmetic number, because the mean of its divisors is an integer number (3137792).

Almost surely, 2^21492164 is an apocalyptic number.

It is an amenable number.

21492164 is a deficient number, since it is larger than the sum of its proper divisors (16161340).

21492164 is a wasteful number, since it uses less digits than its factorization.

21492164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6034 (or 6032 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21492164 is about 4635.9641931318. The cubic root of 21492164 is about 278.0311025705.

The spelling of 21492164 in words is "twenty-one million, four hundred ninety-two thousand, one hundred sixty-four".