15314997421 has 2 divisors, whose sum is σ = 15314997422. Its totient is φ = 15314997420.

The previous prime is 15314997389. The next prime is 15314997431. The reversal of 15314997421 is 12479941351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11656441225 + 3658556196 = 107965^2 + 60486^2 .

It is an emirp because it is prime and its reverse (12479941351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15314997421 - 2⁵ = 15314997389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15314997431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7657498710 + 7657498711.

It is an arithmetic number, because the mean of its divisors is an integer number (7657498711).

Almost surely, 2^15314997421 is an apocalyptic number.

It is an amenable number.

15314997421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15314997421 is an equidigital number, since it uses as much as digits as its factorization.

15314997421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The spelling of 15314997421 in words is "fifteen billion, three hundred fourteen million, nine hundred ninety-seven thousand, four hundred twenty-one".