25310242121 has 4 divisors (see below), whose sum is σ = 25378098372. Its totient is φ = 25242385872.

The previous prime is 25310242033. The next prime is 25310242189. The reversal of 25310242121 is 12124201352.

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 21473678521 + 3836563600 = 146539^2 + 61940^2 .

It is a cyclic number.

It is not a de Polignac number, because 25310242121 - 2³⁴ = 8130372937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25310242421) 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, 33927566 + ... + 33928311.

It is an arithmetic number, because the mean of its divisors is an integer number (6344524593).

Almost surely, 2^25310242121 is an apocalyptic number.

It is an amenable number.

25310242121 is a deficient number, since it is larger than the sum of its proper divisors (67856251).

25310242121 is an equidigital number, since it uses as much as digits as its factorization.

25310242121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67856250.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 25310242121 its reverse (12124201352), we get a palindrome (37434443473).

The spelling of 25310242121 in words is "twenty-five billion, three hundred ten million, two hundred forty-two thousand, one hundred twenty-one".