21164273 has 8 divisors (see below), whose sum is σ = 22870848. Its totient is φ = 19468944.

The previous prime is 21164239. The next prime is 21164281. The reversal of 21164273 is 37246112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21164273 - 2¹² = 21160177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21164293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1340 + ... + 6642.

It is an arithmetic number, because the mean of its divisors is an integer number (2858856).

Almost surely, 2^21164273 is an apocalyptic number.

It is an amenable number.

21164273 is a deficient number, since it is larger than the sum of its proper divisors (1706575).

21164273 is a wasteful number, since it uses less digits than its factorization.

21164273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5623.

The product of its digits is 2016, while the sum is 26.

The square root of 21164273 is about 4600.4644330763. The cubic root of 21164273 is about 276.6099415970.

The spelling of 21164273 in words is "twenty-one million, one hundred sixty-four thousand, two hundred seventy-three".