25160221 has 4 divisors (see below), whose sum is σ = 26640252. Its totient is φ = 23680192.

The previous prime is 25160173. The next prime is 25160227. The reversal of 25160221 is 12206152.

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 15888196 + 9272025 = 3986^2 + 3045^2 .

It is a cyclic number.

It is not a de Polignac number, because 25160221 - 2¹¹ = 25158173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25160227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 739990 + ... + 740023.

It is an arithmetic number, because the mean of its divisors is an integer number (6660063).

Almost surely, 2^25160221 is an apocalyptic number.

It is an amenable number.

25160221 is a deficient number, since it is larger than the sum of its proper divisors (1480031).

25160221 is a wasteful number, since it uses less digits than its factorization.

25160221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480030.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 25160221 is about 5015.9965111631. The cubic root of 25160221 is about 293.0250961820.

Adding to 25160221 its reverse (12206152), we get a palindrome (37366373).

The spelling of 25160221 in words is "twenty-five million, one hundred sixty thousand, two hundred twenty-one".