3125008021 has 4 divisors (see below), whose sum is σ = 3125664000. Its totient is φ = 3124352044.

The previous prime is 3125007997. The next prime is 3125008039. The reversal of 3125008021 is 1208005213.

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 3125008021 - 2⁵ = 3125007989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3125007983 and 3125008001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3125008721) 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, 320791 + ... + 330388.

It is an arithmetic number, because the mean of its divisors is an integer number (781416000).

Almost surely, 2^3125008021 is an apocalyptic number.

It is an amenable number.

3125008021 is a deficient number, since it is larger than the sum of its proper divisors (655979).

3125008021 is an equidigital number, since it uses as much as digits as its factorization.

3125008021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655978.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 3125008021 is about 55901.7711794537. The cubic root of 3125008021 is about 1462.0101199612.

The spelling of 3125008021 in words is "three billion, one hundred twenty-five million, eight thousand, twenty-one".