25220121 has 8 divisors (see below), whose sum is σ = 35088960. Its totient is φ = 16082352.

The previous prime is 25220119. The next prime is 25220147. The reversal of 25220121 is 12102252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25220121 - 2¹ = 25220119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25220121.

It is not an unprimeable number, because it can be changed into a prime (25220161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182686 + ... + 182823.

It is an arithmetic number, because the mean of its divisors is an integer number (4386120).

Almost surely, 2^25220121 is an apocalyptic number.

It is an amenable number.

25220121 is a deficient number, since it is larger than the sum of its proper divisors (9868839).

25220121 is a wasteful number, since it uses less digits than its factorization.

25220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365535.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 25220121 is about 5021.9638588903. The cubic root of 25220121 is about 293.2574509582.

Adding to 25220121 its reverse (12102252), we get a palindrome (37322373).

The spelling of 25220121 in words is "twenty-five million, two hundred twenty thousand, one hundred twenty-one".