25235621 has 2 divisors, whose sum is σ = 25235622. Its totient is φ = 25235620.

The previous prime is 25235549. The next prime is 25235627. The reversal of 25235621 is 12653252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24611521 + 624100 = 4961^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 25235621 - 2¹⁰ = 25234597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25235627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12617810 + 12617811.

It is an arithmetic number, because the mean of its divisors is an integer number (12617811).

Almost surely, 2^25235621 is an apocalyptic number.

It is an amenable number.

25235621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25235621 is an equidigital number, since it uses as much as digits as its factorization.

25235621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 26.

The square root of 25235621 is about 5023.5068428340. The cubic root of 25235621 is about 293.3175162213.

Adding to 25235621 its reverse (12653252), we get a palindrome (37888873).

The spelling of 25235621 in words is "twenty-five million, two hundred thirty-five thousand, six hundred twenty-one".