25928230821 has 4 divisors (see below), whose sum is σ = 34570974432. Its totient is φ = 17285487212.

The previous prime is 25928230817. The next prime is 25928230831. The reversal of 25928230821 is 12803282952.

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 25928230821 - 2² = 25928230817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25928230831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4321371801 + ... + 4321371806.

It is an arithmetic number, because the mean of its divisors is an integer number (8642743608).

Almost surely, 2^25928230821 is an apocalyptic number.

It is an amenable number.

25928230821 is a deficient number, since it is larger than the sum of its proper divisors (8642743611).

25928230821 is an equidigital number, since it uses as much as digits as its factorization.

25928230821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8642743610.

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 25928230821 in words is "twenty-five billion, nine hundred twenty-eight million, two hundred thirty thousand, eight hundred twenty-one".