21364311 has 4 divisors (see below), whose sum is σ = 28485752. Its totient is φ = 14242872.

The previous prime is 21364307. The next prime is 21364319. The reversal of 21364311 is 11346312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21364311 - 2² = 21364307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364319) 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, 3560716 + ... + 3560721.

It is an arithmetic number, because the mean of its divisors is an integer number (7121438).

Almost surely, 2^21364311 is an apocalyptic number.

21364311 is a deficient number, since it is larger than the sum of its proper divisors (7121441).

21364311 is an equidigital number, since it uses as much as digits as its factorization.

21364311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7121440.

The product of its digits is 432, while the sum is 21.

The square root of 21364311 is about 4622.1543678246. The cubic root of 21364311 is about 277.4786867812.

The spelling of 21364311 in words is "twenty-one million, three hundred sixty-four thousand, three hundred eleven".