21370711 has 4 divisors (see below), whose sum is σ = 21403800. Its totient is φ = 21337624.

The previous prime is 21370693. The next prime is 21370721. The reversal of 21370711 is 11707312.

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

It is a cyclic number.

It is not a de Polignac number, because 21370711 - 2⁹ = 21370199 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 (21370721) 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, 15556 + ... + 16873.

It is an arithmetic number, because the mean of its divisors is an integer number (5350950).

Almost surely, 2^21370711 is an apocalyptic number.

21370711 is a deficient number, since it is larger than the sum of its proper divisors (33089).

21370711 is an equidigital number, since it uses as much as digits as its factorization.

21370711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33088.

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 21370711 is about 4622.8466338394. The cubic root of 21370711 is about 277.5063916500.

The spelling of 21370711 in words is "twenty-one million, three hundred seventy thousand, seven hundred eleven".