23987221513 has 2 divisors, whose sum is σ = 23987221514. Its totient is φ = 23987221512.

The previous prime is 23987221469. The next prime is 23987221529. The reversal of 23987221513 is 31512278932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23985336384 + 1885129 = 154872^2 + 1373^2 .

It is a cyclic number.

It is not a de Polignac number, because 23987221513 - 2³³ = 15397286921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23987221513.

It is not a weakly prime, because it can be changed into another prime (23987221813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11993610756 + 11993610757.

It is an arithmetic number, because the mean of its divisors is an integer number (11993610757).

Almost surely, 2^23987221513 is an apocalyptic number.

It is an amenable number.

23987221513 is a deficient number, since it is larger than the sum of its proper divisors (1).

23987221513 is an equidigital number, since it uses as much as digits as its factorization.

23987221513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The spelling of 23987221513 in words is "twenty-three billion, nine hundred eighty-seven million, two hundred twenty-one thousand, five hundred thirteen".