12521552451413 has 4 divisors (see below), whose sum is σ = 12575293020108. Its totient is φ = 12467811882720.

The previous prime is 12521552451409. The next prime is 12521552451427. The reversal of 12521552451413 is 31415425512521.

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 6788697993169 + 5732854458244 = 2605513^2 + 2394338^2 .

It is a cyclic number.

It is not a de Polignac number, because 12521552451413 - 2² = 12521552451409 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 (12521552451433) 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, 26870283998 + ... + 26870284463.

It is an arithmetic number, because the mean of its divisors is an integer number (3143823255027).

Almost surely, 2^{12521552451413} is an apocalyptic number.

It is an amenable number.

12521552451413 is a deficient number, since it is larger than the sum of its proper divisors (53740568695).

12521552451413 is an equidigital number, since it uses as much as digits as its factorization.

12521552451413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53740568694.

The product of its digits is 240000, while the sum is 41.

Adding to 12521552451413 its reverse (31415425512521), we get a palindrome (43936977963934).

The spelling of 12521552451413 in words is "twelve trillion, five hundred twenty-one billion, five hundred fifty-two million, four hundred fifty-one thousand, four hundred thirteen".