15011512421 has 2 divisors, whose sum is σ = 15011512422. Its totient is φ = 15011512420.

The previous prime is 15011512403. The next prime is 15011512423. The reversal of 15011512421 is 12421511051.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8689036225 + 6322476196 = 93215^2 + 79514^2 .

It is a cyclic number.

It is not a de Polignac number, because 15011512421 - 2²⁶ = 14944403557 is a prime.

Together with 15011512423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15011512423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7505756210 + 7505756211.

It is an arithmetic number, because the mean of its divisors is an integer number (7505756211).

Almost surely, 2^15011512421 is an apocalyptic number.

It is an amenable number.

15011512421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15011512421 is an equidigital number, since it uses as much as digits as its factorization.

15011512421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 23.

The spelling of 15011512421 in words is "fifteen billion, eleven million, five hundred twelve thousand, four hundred twenty-one".