4721825921 has 2 divisors, whose sum is σ = 4721825922. Its totient is φ = 4721825920.

The previous prime is 4721825909. The next prime is 4721825947. The reversal of 4721825921 is 1295281274.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2722752400 + 1999073521 = 52180^2 + 44711^2 .

It is a cyclic number.

It is not a de Polignac number, because 4721825921 - 2¹⁰ = 4721824897 is a prime.

It is not a weakly prime, because it can be changed into another prime (4721825321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2360912960 + 2360912961.

It is an arithmetic number, because the mean of its divisors is an integer number (2360912961).

Almost surely, 2^4721825921 is an apocalyptic number.

It is an amenable number.

4721825921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4721825921 is an equidigital number, since it uses as much as digits as its factorization.

4721825921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 4721825921 is about 68715.5435181881. The cubic root of 4721825921 is about 1677.6575821723.

The spelling of 4721825921 in words is "four billion, seven hundred twenty-one million, eight hundred twenty-five thousand, nine hundred twenty-one".