12525887221 has 2 divisors, whose sum is σ = 12525887222. Its totient is φ = 12525887220.

The previous prime is 12525887219. The next prime is 12525887267. The reversal of 12525887221 is 12278852521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11895174225 + 630712996 = 109065^2 + 25114^2 .

It is a cyclic number.

It is not a de Polignac number, because 12525887221 - 2¹ = 12525887219 is a prime.

It is a super-2 number, since 2×12525887221² (a number of 21 digits) contains 22 as substring.

Together with 12525887219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12525887021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6262943610 + 6262943611.

It is an arithmetic number, because the mean of its divisors is an integer number (6262943611).

Almost surely, 2^12525887221 is an apocalyptic number.

It is an amenable number.

12525887221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12525887221 is an equidigital number, since it uses as much as digits as its factorization.

12525887221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 179200, while the sum is 43.

The spelling of 12525887221 in words is "twelve billion, five hundred twenty-five million, eight hundred eighty-seven thousand, two hundred twenty-one".