25234478121 has 16 divisors (see below), whose sum is σ = 34223152320. Its totient is φ = 16534510080.

The previous prime is 25234478081. The next prime is 25234478183. The reversal of 25234478121 is 12187443252.

It is a happy number.

It is not a de Polignac number, because 25234478121 - 2¹¹ = 25234476073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25234478121.

It is not an unprimeable number, because it can be changed into a prime (25234468121) 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, 1113261 + ... + 1135701.

It is an arithmetic number, because the mean of its divisors is an integer number (2138947020).

Almost surely, 2^25234478121 is an apocalyptic number.

It is an amenable number.

25234478121 is a deficient number, since it is larger than the sum of its proper divisors (8988674199).

25234478121 is a wasteful number, since it uses less digits than its factorization.

25234478121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28856.

The product of its digits is 107520, while the sum is 39.

The spelling of 25234478121 in words is "twenty-five billion, two hundred thirty-four million, four hundred seventy-eight thousand, one hundred twenty-one".