25124221 has 4 divisors (see below), whose sum is σ = 25803292. Its totient is φ = 24445152.

The previous prime is 25124207. The next prime is 25124227. The reversal of 25124221 is 12242152.

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 9084196 + 16040025 = 3014^2 + 4005^2 .

It is a cyclic number.

It is not a de Polignac number, because 25124221 - 2¹¹ = 25122173 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 (25124227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339480 + ... + 339553.

It is an arithmetic number, because the mean of its divisors is an integer number (6450823).

Almost surely, 2^25124221 is an apocalyptic number.

It is an amenable number.

25124221 is a deficient number, since it is larger than the sum of its proper divisors (679071).

25124221 is an equidigital number, since it uses as much as digits as its factorization.

25124221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679070.

The product of its digits is 320, while the sum is 19.

The square root of 25124221 is about 5012.4067073612. The cubic root of 25124221 is about 292.8852731031.

Adding to 25124221 its reverse (12242152), we get a palindrome (37366373).

The spelling of 25124221 in words is "twenty-five million, one hundred twenty-four thousand, two hundred twenty-one".