25342304021 has 4 divisors (see below), whose sum is σ = 25627049100. Its totient is φ = 25057558944.

The previous prime is 25342304011. The next prime is 25342304033. The reversal of 25342304021 is 12040324352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16773099121 + 8569204900 = 129511^2 + 92570^2 .

It is a cyclic number.

It is not a de Polignac number, because 25342304021 - 2⁶ = 25342303957 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 (25342304011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142372406 + ... + 142372583.

It is an arithmetic number, because the mean of its divisors is an integer number (6406762275).

Almost surely, 2^25342304021 is an apocalyptic number.

It is an amenable number.

25342304021 is a deficient number, since it is larger than the sum of its proper divisors (284745079).

25342304021 is an equidigital number, since it uses as much as digits as its factorization.

25342304021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284745078.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 25342304021 its reverse (12040324352), we get a palindrome (37382628373).

The spelling of 25342304021 in words is "twenty-five billion, three hundred forty-two million, three hundred four thousand, twenty-one".