21371318095 has 4 divisors (see below), whose sum is σ = 25645581720. Its totient is φ = 17097054472.

The previous prime is 21371318093. The next prime is 21371318119. The reversal of 21371318095 is 59081317312.

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 21371318095 - 2¹ = 21371318093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371318093) 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, 2137131805 + ... + 2137131814.

It is an arithmetic number, because the mean of its divisors is an integer number (6411395430).

Almost surely, 2^21371318095 is an apocalyptic number.

21371318095 is a deficient number, since it is larger than the sum of its proper divisors (4274263625).

21371318095 is an equidigital number, since it uses as much as digits as its factorization.

21371318095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4274263624.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 21371318095 in words is "twenty-one billion, three hundred seventy-one million, three hundred eighteen thousand, ninety-five".