25275254021 has 4 divisors (see below), whose sum is σ = 25282094412. Its totient is φ = 25268413632.

The previous prime is 25275254009. The next prime is 25275254023. The reversal of 25275254021 is 12045257252.

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 6481860100 + 18793393921 = 80510^2 + 137089^2 .

It is a cyclic number.

It is not a de Polignac number, because 25275254021 - 2¹⁰ = 25275252997 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 (25275254023) 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, 3414650 + ... + 3422043.

It is an arithmetic number, because the mean of its divisors is an integer number (6320523603).

Almost surely, 2^25275254021 is an apocalyptic number.

It is an amenable number.

25275254021 is a deficient number, since it is larger than the sum of its proper divisors (6840391).

25275254021 is an equidigital number, since it uses as much as digits as its factorization.

25275254021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840390.

The product of its (nonzero) digits is 56000, while the sum is 35.

The spelling of 25275254021 in words is "twenty-five billion, two hundred seventy-five million, two hundred fifty-four thousand, twenty-one".