25339868221 has 2 divisors, whose sum is σ = 25339868222. Its totient is φ = 25339868220.

The previous prime is 25339868219. The next prime is 25339868233. The reversal of 25339868221 is 12286893352.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20507672025 + 4832196196 = 143205^2 + 69514^2 .

It is a cyclic number.

It is not a de Polignac number, because 25339868221 - 2¹ = 25339868219 is a prime.

Together with 25339868219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25339868291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12669934110 + 12669934111.

It is an arithmetic number, because the mean of its divisors is an integer number (12669934111).

Almost surely, 2^25339868221 is an apocalyptic number.

It is an amenable number.

25339868221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25339868221 is an equidigital number, since it uses as much as digits as its factorization.

25339868221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 49.

The spelling of 25339868221 in words is "twenty-five billion, three hundred thirty-nine million, eight hundred sixty-eight thousand, two hundred twenty-one".