25111261325021 has 4 divisors (see below), whose sum is σ = 25223867878272. Its totient is φ = 24998654771772.

The previous prime is 25111261324979. The next prime is 25111261325039. The reversal of 25111261325021 is 12052316211152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25111261325021 - 2³⁰ = 25110187583197 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 (25111261325221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56303276291 + ... + 56303276736.

It is an arithmetic number, because the mean of its divisors is an integer number (6305966969568).

Almost surely, 2^{25111261325021} is an apocalyptic number.

It is an amenable number.

25111261325021 is a deficient number, since it is larger than the sum of its proper divisors (112606553251).

25111261325021 is a wasteful number, since it uses less digits than its factorization.

25111261325021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112606553250.

The product of its (nonzero) digits is 7200, while the sum is 32.

Adding to 25111261325021 its reverse (12052316211152), we get a palindrome (37163577536173).

The spelling of 25111261325021 in words is "twenty-five trillion, one hundred eleven billion, two hundred sixty-one million, three hundred twenty-five thousand, twenty-one".