21331320220311 has 12 divisors (see below), whose sum is σ = 29388832440696. Its totient is φ = 13762142075760.

The previous prime is 21331320220289. The next prime is 21331320220349. The reversal of 21331320220311 is 11302202313312.

It is not a de Polignac number, because 21331320220311 - 2¹⁹ = 21331319696023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331320220211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3699497676 + ... + 3699503441.

It is an arithmetic number, because the mean of its divisors is an integer number (2449069370058).

Almost surely, 2^{21331320220311} is an apocalyptic number.

21331320220311 is a deficient number, since it is larger than the sum of its proper divisors (8057512220385).

21331320220311 is an equidigital number, since it uses as much as digits as its factorization.

21331320220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7399001182 (or 7399001151 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21331320220311 its reverse (11302202313312), we get a palindrome (32633522533623).

The spelling of 21331320220311 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred twenty million, two hundred twenty thousand, three hundred eleven".