15116125421 has 2 divisors, whose sum is σ = 15116125422. Its totient is φ = 15116125420.

The previous prime is 15116125417. The next prime is 15116125457. The reversal of 15116125421 is 12452161151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13983062500 + 1133062921 = 118250^2 + 33661^2 .

It is a cyclic number.

It is not a de Polignac number, because 15116125421 - 2² = 15116125417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15116125411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7558062710 + 7558062711.

It is an arithmetic number, because the mean of its divisors is an integer number (7558062711).

Almost surely, 2^15116125421 is an apocalyptic number.

It is an amenable number.

15116125421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15116125421 is an equidigital number, since it uses as much as digits as its factorization.

15116125421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 29.

Adding to 15116125421 its reverse (12452161151), we get a palindrome (27568286572).

The spelling of 15116125421 in words is "fifteen billion, one hundred sixteen million, one hundred twenty-five thousand, four hundred twenty-one".