25038867421 has 4 divisors (see below), whose sum is σ = 25320203100. Its totient is φ = 24757531744.

The previous prime is 25038867391. The next prime is 25038867473. The reversal of 25038867421 is 12476883052.

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 4991422500 + 20047444921 = 70650^2 + 141589^2 .

It is a cyclic number.

It is not a de Polignac number, because 25038867421 - 2⁵ = 25038867389 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 (25038867521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140667706 + ... + 140667883.

It is an arithmetic number, because the mean of its divisors is an integer number (6330050775).

Almost surely, 2^25038867421 is an apocalyptic number.

It is an amenable number.

25038867421 is a deficient number, since it is larger than the sum of its proper divisors (281335679).

25038867421 is an equidigital number, since it uses as much as digits as its factorization.

25038867421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281335678.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 25038867421 in words is "twenty-five billion, thirty-eight million, eight hundred sixty-seven thousand, four hundred twenty-one".