25620232921 has 4 divisors (see below), whose sum is σ = 25981081344. Its totient is φ = 25259384500.

The previous prime is 25620232901. The next prime is 25620232943. The reversal of 25620232921 is 12923202652.

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 a cyclic number.

It is not a de Polignac number, because 25620232921 - 2¹⁷ = 25620101849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25620232901) 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, 180424105 + ... + 180424246.

It is an arithmetic number, because the mean of its divisors is an integer number (6495270336).

Almost surely, 2^25620232921 is an apocalyptic number.

It is an amenable number.

25620232921 is a deficient number, since it is larger than the sum of its proper divisors (360848423).

25620232921 is an equidigital number, since it uses as much as digits as its factorization.

25620232921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360848422.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 25620232921 in words is "twenty-five billion, six hundred twenty million, two hundred thirty-two thousand, nine hundred twenty-one".