23131021099 has 2 divisors, whose sum is σ = 23131021100. Its totient is φ = 23131021098.

The previous prime is 23131021091. The next prime is 23131021171. The reversal of 23131021099 is 99012013132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23131021099 - 2³ = 23131021091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23131021099.

It is not a weakly prime, because it can be changed into another prime (23131021091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565510549 + 11565510550.

It is an arithmetic number, because the mean of its divisors is an integer number (11565510550).

Almost surely, 2^23131021099 is an apocalyptic number.

23131021099 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131021099 is an equidigital number, since it uses as much as digits as its factorization.

23131021099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The spelling of 23131021099 in words is "twenty-three billion, one hundred thirty-one million, twenty-one thousand, ninety-nine".