25115322121 has 8 divisors (see below), whose sum is σ = 27586624320. Its totient is φ = 22758964272.

The previous prime is 25115322109. The next prime is 25115322161. The reversal of 25115322121 is 12122351152.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25115322121 - 2¹³ = 25115313929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25115322161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28735630 + ... + 28736503.

It is an arithmetic number, because the mean of its divisors is an integer number (3448328040).

Almost surely, 2^25115322121 is an apocalyptic number.

It is an amenable number.

25115322121 is a deficient number, since it is larger than the sum of its proper divisors (2471302199).

25115322121 is a wasteful number, since it uses less digits than its factorization.

25115322121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57472175.

The product of its digits is 1200, while the sum is 25.

Adding to 25115322121 its reverse (12122351152), we get a palindrome (37237673273).

The spelling of 25115322121 in words is "twenty-five billion, one hundred fifteen million, three hundred twenty-two thousand, one hundred twenty-one".