12512021591 has 2 divisors, whose sum is σ = 12512021592. Its totient is φ = 12512021590.

The previous prime is 12512021579. The next prime is 12512021593. The reversal of 12512021591 is 19512021521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12512021591 - 2¹⁰ = 12512020567 is a prime.

Together with 12512021593, 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 (12512021593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6256010795 + 6256010796.

It is an arithmetic number, because the mean of its divisors is an integer number (6256010796).

Almost surely, 2^12512021591 is an apocalyptic number.

12512021591 is a deficient number, since it is larger than the sum of its proper divisors (1).

12512021591 is an equidigital number, since it uses as much as digits as its factorization.

12512021591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 29.

The spelling of 12512021591 in words is "twelve billion, five hundred twelve million, twenty-one thousand, five hundred ninety-one".