25331021 has 2 divisors, whose sum is σ = 25331022. Its totient is φ = 25331020.

The previous prime is 25331011. The next prime is 25331029. The reversal of 25331021 is 12013352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25110121 + 220900 = 5011^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 25331021 - 2¹⁴ = 25314637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25331029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12665510 + 12665511.

It is an arithmetic number, because the mean of its divisors is an integer number (12665511).

Almost surely, 2^25331021 is an apocalyptic number.

It is an amenable number.

25331021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25331021 is an equidigital number, since it uses as much as digits as its factorization.

25331021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 25331021 is about 5032.9932445812. The cubic root of 25331021 is about 293.6866677409.

Adding to 25331021 its reverse (12013352), we get a palindrome (37344373).

The spelling of 25331021 in words is "twenty-five million, three hundred thirty-one thousand, twenty-one".