25838315221 has 2 divisors, whose sum is σ = 25838315222. Its totient is φ = 25838315220.

The previous prime is 25838315219. The next prime is 25838315297. The reversal of 25838315221 is 12251383852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14279055025 + 11559260196 = 119495^2 + 107514^2 .

It is a cyclic number.

It is not a de Polignac number, because 25838315221 - 2¹ = 25838315219 is a prime.

Together with 25838315219, 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 (25838316221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12919157610 + 12919157611.

It is an arithmetic number, because the mean of its divisors is an integer number (12919157611).

Almost surely, 2^25838315221 is an apocalyptic number.

It is an amenable number.

25838315221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25838315221 is an equidigital number, since it uses as much as digits as its factorization.

25838315221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 40.

The spelling of 25838315221 in words is "twenty-five billion, eight hundred thirty-eight million, three hundred fifteen thousand, two hundred twenty-one".