21365622522271 has 4 divisors (see below), whose sum is σ = 21366022090000. Its totient is φ = 21365222954544.

The previous prime is 21365622522253. The next prime is 21365622522301. The reversal of 21365622522271 is 17222522656312.

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 21365622522271 - 2¹⁷ = 21365622391199 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 (21365622522071) 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, 199703646 + ... + 199810603.

It is an arithmetic number, because the mean of its divisors is an integer number (5341505522500).

Almost surely, 2^{21365622522271} is an apocalyptic number.

21365622522271 is a deficient number, since it is larger than the sum of its proper divisors (399567729).

21365622522271 is an equidigital number, since it uses as much as digits as its factorization.

21365622522271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399567728.

The product of its digits is 1209600, while the sum is 46.

The spelling of 21365622522271 in words is "twenty-one trillion, three hundred sixty-five billion, six hundred twenty-two million, five hundred twenty-two thousand, two hundred seventy-one".