25833291421 has 12 divisors (see below), whose sum is σ = 30095662332. Its totient is φ = 22109891328.

The previous prime is 25833291397. The next prime is 25833291433. The reversal of 25833291421 is 12419233852.

It can be written as a sum of positive squares in 2 ways, for example, as 15533883225 + 10299408196 = 124635^2 + 101486^2 .

It is not a de Polignac number, because 25833291421 - 2⁷ = 25833291293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25833271421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 358710 + ... + 424663.

It is an arithmetic number, because the mean of its divisors is an integer number (2507971861).

Almost surely, 2^25833291421 is an apocalyptic number.

It is an amenable number.

25833291421 is a deficient number, since it is larger than the sum of its proper divisors (4262370911).

25833291421 is an equidigital number, since it uses as much as digits as its factorization.

25833291421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784060 (or 784053 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The spelling of 25833291421 in words is "twenty-five billion, eight hundred thirty-three million, two hundred ninety-one thousand, four hundred twenty-one".