25125056021 has 4 divisors (see below), whose sum is σ = 27057752652. Its totient is φ = 23192359392.

The previous prime is 25125056017. The next prime is 25125056023. The reversal of 25125056021 is 12065052152.

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 1671664996 + 23453391025 = 40886^2 + 153145^2 .

It is a cyclic number.

It is not a de Polignac number, because 25125056021 - 2² = 25125056017 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 (25125056023) 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, 966348296 + ... + 966348321.

It is an arithmetic number, because the mean of its divisors is an integer number (6764438163).

Almost surely, 2^25125056021 is an apocalyptic number.

It is an amenable number.

25125056021 is a deficient number, since it is larger than the sum of its proper divisors (1932696631).

25125056021 is a wasteful number, since it uses less digits than its factorization.

25125056021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932696630.

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 25125056021 in words is "twenty-five billion, one hundred twenty-five million, fifty-six thousand, twenty-one".