25116221 has 4 divisors (see below), whose sum is σ = 27048252. Its totient is φ = 23184192.

The previous prime is 25116211. The next prime is 25116239. The reversal of 25116221 is 12261152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1243225 + 23872996 = 1115^2 + 4886^2 .

It is a cyclic number.

It is not a de Polignac number, because 25116221 - 2¹⁰ = 25115197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25116193 and 25116202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25116211) 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, 965996 + ... + 966021.

It is an arithmetic number, because the mean of its divisors is an integer number (6762063).

Almost surely, 2^25116221 is an apocalyptic number.

It is an amenable number.

25116221 is a deficient number, since it is larger than the sum of its proper divisors (1932031).

25116221 is a wasteful number, since it uses less digits than its factorization.

25116221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932030.

The product of its digits is 240, while the sum is 20.

The square root of 25116221 is about 5011.6086239849. The cubic root of 25116221 is about 292.8541831717.

Adding to 25116221 its reverse (12261152), we get a palindrome (37377373).

The spelling of 25116221 in words is "twenty-five million, one hundred sixteen thousand, two hundred twenty-one".