25525344021 has 16 divisors (see below), whose sum is σ = 35833075200. Its totient is φ = 16117656048.

The previous prime is 25525344011. The next prime is 25525344023. The reversal of 25525344021 is 12044352552.

It is a happy number.

It is not a de Polignac number, because 25525344021 - 2⁹ = 25525343509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25525344023) 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, 218850 + ... + 314556.

It is an arithmetic number, because the mean of its divisors is an integer number (2239567200).

Almost surely, 2^25525344021 is an apocalyptic number.

It is an amenable number.

25525344021 is a deficient number, since it is larger than the sum of its proper divisors (10307731179).

25525344021 is a wasteful number, since it uses less digits than its factorization.

25525344021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100408.

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 25525344021 its reverse (12044352552), we get a palindrome (37569696573).

The spelling of 25525344021 in words is "twenty-five billion, five hundred twenty-five million, three hundred forty-four thousand, twenty-one".