25123121242 has 16 divisors (see below), whose sum is σ = 37949786280. Its totient is φ = 12473373952.

The previous prime is 25123121207. The next prime is 25123121269. The reversal of 25123121242 is 24212132152.

It can be written as a sum of positive squares in 4 ways, for example, as 23811884721 + 1311236521 = 154311^2 + 36211^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235038 + ... + 324790.

Almost surely, 2^25123121242 is an apocalyptic number.

25123121242 is a deficient number, since it is larger than the sum of its proper divisors (12826665038).

25123121242 is a wasteful number, since it uses less digits than its factorization.

25123121242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90737.

The product of its digits is 1920, while the sum is 25.

Adding to 25123121242 its reverse (24212132152), we get a palindrome (49335253394).

The spelling of 25123121242 in words is "twenty-five billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred forty-two".