4120908821 has 2 divisors, whose sum is σ = 4120908822. Its totient is φ = 4120908820.

The previous prime is 4120908809. The next prime is 4120908829. The reversal of 4120908821 is 1288090214.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3717340900 + 403567921 = 60970^2 + 20089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4120908821 is a prime.

It is a super-2 number, since 2×4120908821² = 33963779021991220082, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4120908829) 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, 2060454410 + 2060454411.

It is an arithmetic number, because the mean of its divisors is an integer number (2060454411).

Almost surely, 2^4120908821 is an apocalyptic number.

It is an amenable number.

4120908821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4120908821 is an equidigital number, since it uses as much as digits as its factorization.

4120908821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 4120908821 is about 64194.3052069263. The cubic root of 4120908821 is about 1603.2367836719.

The spelling of 4120908821 in words is "four billion, one hundred twenty million, nine hundred eight thousand, eight hundred twenty-one".