15315351421 has 2 divisors, whose sum is σ = 15315351422. Its totient is φ = 15315351420.

The previous prime is 15315351407. The next prime is 15315351449. The reversal of 15315351421 is 12415351351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11596059225 + 3719292196 = 107685^2 + 60986^2 .

It is a cyclic number.

It is not a de Polignac number, because 15315351421 - 2¹³ = 15315343229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15315051421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7657675710 + 7657675711.

It is an arithmetic number, because the mean of its divisors is an integer number (7657675711).

Almost surely, 2^15315351421 is an apocalyptic number.

It is an amenable number.

15315351421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15315351421 is an equidigital number, since it uses as much as digits as its factorization.

15315351421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 31.

The spelling of 15315351421 in words is "fifteen billion, three hundred fifteen million, three hundred fifty-one thousand, four hundred twenty-one".