21321230031311 has 4 divisors (see below), whose sum is σ = 24367120035792. Its totient is φ = 18275340026832.

The previous prime is 21321230031301. The next prime is 21321230031337. The reversal of 21321230031311 is 11313003212312.

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

It is not a de Polignac number, because 21321230031311 - 2²² = 21321225837007 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 (21321230031301) 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, 1522945002230 + ... + 1522945002243.

It is an arithmetic number, because the mean of its divisors is an integer number (6091780008948).

Almost surely, 2^{21321230031311} is an apocalyptic number.

21321230031311 is a deficient number, since it is larger than the sum of its proper divisors (3045890004481).

21321230031311 is an equidigital number, since it uses as much as digits as its factorization.

21321230031311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045890004480.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21321230031311 its reverse (11313003212312), we get a palindrome (32634233243623).

The spelling of 21321230031311 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred thirty million, thirty-one thousand, three hundred eleven".