25323624021 has 4 divisors (see below), whose sum is σ = 33764832032. Its totient is φ = 16882416012.

The previous prime is 25323623999. The next prime is 25323624041. The reversal of 25323624021 is 12042632352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25323624021 - 2⁶ = 25323623957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25323624021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25323624041) 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, 4220604001 + ... + 4220604006.

It is an arithmetic number, because the mean of its divisors is an integer number (8441208008).

Almost surely, 2^25323624021 is an apocalyptic number.

It is an amenable number.

25323624021 is a deficient number, since it is larger than the sum of its proper divisors (8441208011).

25323624021 is an equidigital number, since it uses as much as digits as its factorization.

25323624021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8441208010.

The product of its (nonzero) digits is 17280, while the sum is 30.

The spelling of 25323624021 in words is "twenty-five billion, three hundred twenty-three million, six hundred twenty-four thousand, twenty-one".