12505941521 has 2 divisors, whose sum is σ = 12505941522. Its totient is φ = 12505941520.

The previous prime is 12505941499. The next prime is 12505941551. The reversal of 12505941521 is 12514950521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12423331600 + 82609921 = 111460^2 + 9089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12505941521 is a prime.

It is not a weakly prime, because it can be changed into another prime (12505941551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6252970760 + 6252970761.

It is an arithmetic number, because the mean of its divisors is an integer number (6252970761).

Almost surely, 2^12505941521 is an apocalyptic number.

It is an amenable number.

12505941521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12505941521 is an equidigital number, since it uses as much as digits as its factorization.

12505941521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 35.

The spelling of 12505941521 in words is "twelve billion, five hundred five million, nine hundred forty-one thousand, five hundred twenty-one".