30125765821 has 4 divisors (see below), whose sum is σ = 30130274944. Its totient is φ = 30121256700.

The previous prime is 30125765797. The next prime is 30125765867. The reversal of 30125765821 is 12856752103.

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 30125765821 - 2²⁵ = 30092211389 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 (30125765321) 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, 2244525 + ... + 2257906.

It is an arithmetic number, because the mean of its divisors is an integer number (7532568736).

Almost surely, 2^30125765821 is an apocalyptic number.

It is an amenable number.

30125765821 is a deficient number, since it is larger than the sum of its proper divisors (4509123).

30125765821 is an equidigital number, since it uses as much as digits as its factorization.

30125765821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4509122.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 30125765821 in words is "thirty billion, one hundred twenty-five million, seven hundred sixty-five thousand, eight hundred twenty-one".