21331310231311 has 4 divisors (see below), whose sum is σ = 22586093186112. Its totient is φ = 20076527276512.

The previous prime is 21331310231269. The next prime is 21331310231323. The reversal of 21331310231311 is 11313201313312.

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

It is not a de Polignac number, because 21331310231311 - 2¹⁹ = 21331309707023 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 (21331310231111) 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, 627391477375 + ... + 627391477408.

It is an arithmetic number, because the mean of its divisors is an integer number (5646523296528).

Almost surely, 2^{21331310231311} is an apocalyptic number.

21331310231311 is a deficient number, since it is larger than the sum of its proper divisors (1254782954801).

21331310231311 is a wasteful number, since it uses less digits than its factorization.

21331310231311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254782954800.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 21331310231311 its reverse (11313201313312), we get a palindrome (32644511544623).

The spelling of 21331310231311 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred ten million, two hundred thirty-one thousand, three hundred eleven".