15328274921 has 2 divisors, whose sum is σ = 15328274922. Its totient is φ = 15328274920.

The previous prime is 15328274891. The next prime is 15328274939. The reversal of 15328274921 is 12947282351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11265487321 + 4062787600 = 106139^2 + 63740^2 .

It is a cyclic number.

It is not a de Polignac number, because 15328274921 - 2¹⁰ = 15328273897 is a prime.

It is not a weakly prime, because it can be changed into another prime (15328274971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7664137460 + 7664137461.

It is an arithmetic number, because the mean of its divisors is an integer number (7664137461).

Almost surely, 2^15328274921 is an apocalyptic number.

It is an amenable number.

15328274921 is a deficient number, since it is larger than the sum of its proper divisors (1).

15328274921 is an equidigital number, since it uses as much as digits as its factorization.

15328274921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The spelling of 15328274921 in words is "fifteen billion, three hundred twenty-eight million, two hundred seventy-four thousand, nine hundred twenty-one".