15124331921 has 2 divisors, whose sum is σ = 15124331922. Its totient is φ = 15124331920.

The previous prime is 15124331903. The next prime is 15124331933. The reversal of 15124331921 is 12913342151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8885701696 + 6238630225 = 94264^2 + 78985^2 .

It is a cyclic number.

It is not a de Polignac number, because 15124331921 - 2¹⁸ = 15124069777 is a prime.

It is not a weakly prime, because it can be changed into another prime (15124331941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7562165960 + 7562165961.

It is an arithmetic number, because the mean of its divisors is an integer number (7562165961).

Almost surely, 2^15124331921 is an apocalyptic number.

It is an amenable number.

15124331921 is a deficient number, since it is larger than the sum of its proper divisors (1).

15124331921 is an equidigital number, since it uses as much as digits as its factorization.

15124331921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The spelling of 15124331921 in words is "fifteen billion, one hundred twenty-four million, three hundred thirty-one thousand, nine hundred twenty-one".