12501255526621 has 4 divisors (see below), whose sum is σ = 12806164198044. Its totient is φ = 12196346855200.

The previous prime is 12501255526603. The next prime is 12501255526633. The reversal of 12501255526621 is 12662555210521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2195550464121 + 10305705062500 = 1481739^2 + 3210250^2 .

It is a cyclic number.

It is not a de Polignac number, because 12501255526621 - 2²³ = 12501247138013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12501255526681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152454335650 + ... + 152454335731.

It is an arithmetic number, because the mean of its divisors is an integer number (3201541049511).

Almost surely, 2^{12501255526621} is an apocalyptic number.

It is an amenable number.

12501255526621 is a deficient number, since it is larger than the sum of its proper divisors (304908671423).

12501255526621 is an equidigital number, since it uses as much as digits as its factorization.

12501255526621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304908671422.

The product of its (nonzero) digits is 360000, while the sum is 43.

The spelling of 12501255526621 in words is "twelve trillion, five hundred one billion, two hundred fifty-five million, five hundred twenty-six thousand, six hundred twenty-one".