21164353 has 4 divisors (see below), whose sum is σ = 24187840. Its totient is φ = 18140868.

The previous prime is 21164327. The next prime is 21164357. The reversal of 21164353 is 35346112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21164353 - 2⁵ = 21164321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21164357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511733 + ... + 1511746.

It is an arithmetic number, because the mean of its divisors is an integer number (6046960).

Almost surely, 2^21164353 is an apocalyptic number.

It is an amenable number.

21164353 is a deficient number, since it is larger than the sum of its proper divisors (3023487).

21164353 is an equidigital number, since it uses as much as digits as its factorization.

21164353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3023486.

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

The square root of 21164353 is about 4600.4731278424. The cubic root of 21164353 is about 276.6102901209.

The spelling of 21164353 in words is "twenty-one million, one hundred sixty-four thousand, three hundred fifty-three".