25621252470121 has 16 divisors (see below), whose sum is σ = 32173188203520. Its totient is φ = 19820982001680.

The previous prime is 25621252470103. The next prime is 25621252470133. The reversal of 25621252470121 is 12107425212652.

It is a cyclic number.

It is not a de Polignac number, because 25621252470121 - 2⁷ = 25621252469993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20621252470121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1196908501 + ... + 1196929906.

It is an arithmetic number, because the mean of its divisors is an integer number (2010824262720).

Almost surely, 2^{25621252470121} is an apocalyptic number.

It is an amenable number.

25621252470121 is a deficient number, since it is larger than the sum of its proper divisors (6551935733399).

25621252470121 is a wasteful number, since it uses less digits than its factorization.

25621252470121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393838564.

The product of its (nonzero) digits is 134400, while the sum is 40.

Adding to 25621252470121 its reverse (12107425212652), we get a palindrome (37728677682773).

The spelling of 25621252470121 in words is "twenty-five trillion, six hundred twenty-one billion, two hundred fifty-two million, four hundred seventy thousand, one hundred twenty-one".