25121221344525 has 48 divisors (see below), whose sum is σ = 41930791257600. Its totient is φ = 13269960749760.

The previous prime is 25121221344497. The next prime is 25121221344529. The reversal of 25121221344525 is 52544312212152.

It is a happy number.

It is not a de Polignac number, because 25121221344525 - 2²⁴ = 25121204567309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25121221344529) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37862086 + ... + 38519864.

It is an arithmetic number, because the mean of its divisors is an integer number (873558151200).

Almost surely, 2^{25121221344525} is an apocalyptic number.

25121221344525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25121221344525 is a deficient number, since it is larger than the sum of its proper divisors (16809569913075).

25121221344525 is a wasteful number, since it uses less digits than its factorization.

25121221344525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662658 (or 662653 counting only the distinct ones).

The product of its digits is 192000, while the sum is 39.

Adding to 25121221344525 its reverse (52544312212152), we get a palindrome (77665533556677).

The spelling of 25121221344525 in words is "twenty-five trillion, one hundred twenty-one billion, two hundred twenty-one million, three hundred forty-four thousand, five hundred twenty-five".