21311331040331 has 4 divisors (see below), whose sum is σ = 21394254507672. Its totient is φ = 21228407572992.

The previous prime is 21311331040291. The next prime is 21311331040343. The reversal of 21311331040331 is 13304013311312.

It is a happy number.

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 21311331040331 - 2¹⁸ = 21311330778187 is a prime.

It is a super-2 number, since 2×21311331040331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21311331040331.

It is not an unprimeable number, because it can be changed into a prime (21311331040931) 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, 41461733285 + ... + 41461733798.

It is an arithmetic number, because the mean of its divisors is an integer number (5348563626918).

Almost surely, 2^{21311331040331} is an apocalyptic number.

21311331040331 is a deficient number, since it is larger than the sum of its proper divisors (82923467341).

21311331040331 is an equidigital number, since it uses as much as digits as its factorization.

21311331040331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82923467340.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 21311331040331 its reverse (13304013311312), we get a palindrome (34615344351643).

The spelling of 21311331040331 in words is "twenty-one trillion, three hundred eleven billion, three hundred thirty-one million, forty thousand, three hundred thirty-one".