21131220312023 has 2 divisors, whose sum is σ = 21131220312024. Its totient is φ = 21131220312022.

The previous prime is 21131220311953. The next prime is 21131220312043. The reversal of 21131220312023 is 32021302213112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21131220312023 - 2³² = 21126925344727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21131220312023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131220312043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565610156011 + 10565610156012.

It is an arithmetic number, because the mean of its divisors is an integer number (10565610156012).

Almost surely, 2^{21131220312023} is an apocalyptic number.

21131220312023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131220312023 is an equidigital number, since it uses as much as digits as its factorization.

21131220312023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21131220312023 its reverse (32021302213112), we get a palindrome (53152522525135).

The spelling of 21131220312023 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred twenty million, three hundred twelve thousand, twenty-three".