25213121 has 4 divisors (see below), whose sum is σ = 25223472. Its totient is φ = 25202772.

The previous prime is 25213109. The next prime is 25213127. The reversal of 25213121 is 12131252.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25213121 - 2¹⁰ = 25212097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25213121.

It is not an unprimeable number, because it can be changed into a prime (25213127) 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, 710 + ... + 7136.

It is an arithmetic number, because the mean of its divisors is an integer number (6305868).

Almost surely, 2^25213121 is an apocalyptic number.

It is an amenable number.

25213121 is a deficient number, since it is larger than the sum of its proper divisors (10351).

25213121 is an equidigital number, since it uses as much as digits as its factorization.

25213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10350.

The product of its digits is 120, while the sum is 17.

The square root of 25213121 is about 5021.2668720155. The cubic root of 25213121 is about 293.2303166434.

Adding to 25213121 its reverse (12131252), we get a palindrome (37344373).

The spelling of 25213121 in words is "twenty-five million, two hundred thirteen thousand, one hundred twenty-one".