25133621 has 2 divisors, whose sum is σ = 25133622. Its totient is φ = 25133620.

The previous prime is 25133611. The next prime is 25133623. The reversal of 25133621 is 12633152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19704721 + 5428900 = 4439^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 25133621 - 2¹⁴ = 25117237 is a prime.

Together with 25133623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25133623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12566810 + 12566811.

It is an arithmetic number, because the mean of its divisors is an integer number (12566811).

Almost surely, 2^25133621 is an apocalyptic number.

It is an amenable number.

25133621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25133621 is an equidigital number, since it uses as much as digits as its factorization.

25133621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 23.

The square root of 25133621 is about 5013.3442929845. The cubic root of 25133621 is about 292.9217953404.

Adding to 25133621 its reverse (12633152), we get a palindrome (37766773).

The spelling of 25133621 in words is "twenty-five million, one hundred thirty-three thousand, six hundred twenty-one".