12521205539 has 2 divisors, whose sum is σ = 12521205540. Its totient is φ = 12521205538.

The previous prime is 12521205509. The next prime is 12521205547. The reversal of 12521205539 is 93550212521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12521205539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12521205499 and 12521205508.

It is not a weakly prime, because it can be changed into another prime (12521205509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6260602769 + 6260602770.

It is an arithmetic number, because the mean of its divisors is an integer number (6260602770).

Almost surely, 2^12521205539 is an apocalyptic number.

12521205539 is a deficient number, since it is larger than the sum of its proper divisors (1).

12521205539 is an equidigital number, since it uses as much as digits as its factorization.

12521205539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 12521205539 in words is "twelve billion, five hundred twenty-one million, two hundred five thousand, five hundred thirty-nine".