21130131023 has 2 divisors, whose sum is σ = 21130131024. Its totient is φ = 21130131022.

The previous prime is 21130131019. The next prime is 21130131031. The reversal of 21130131023 is 32013103112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21130131023 - 2² = 21130131019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21130130992 and 21130131010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21130131013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565065511 + 10565065512.

It is an arithmetic number, because the mean of its divisors is an integer number (10565065512).

Almost surely, 2^21130131023 is an apocalyptic number.

21130131023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130131023 is an equidigital number, since it uses as much as digits as its factorization.

21130131023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21130131023 its reverse (32013103112), we get a palindrome (53143234135).

The spelling of 21130131023 in words is "twenty-one billion, one hundred thirty million, one hundred thirty-one thousand, twenty-three".