3900120121 has 4 divisors (see below), whose sum is σ = 3995245044. Its totient is φ = 3804995200.

The previous prime is 3900120061. The next prime is 3900120149. The reversal of 3900120121 is 1210210093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1210210093 = 17 ⋅71188829.

It can be written as a sum of positive squares in 2 ways, for example, as 63680400 + 3836439721 = 7980^2 + 61939^2 .

It is a cyclic number.

It is not a de Polignac number, because 3900120121 - 2²³ = 3891731513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3900120181) 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, 47562400 + ... + 47562481.

It is an arithmetic number, because the mean of its divisors is an integer number (998811261).

Almost surely, 2^3900120121 is an apocalyptic number.

It is an amenable number.

3900120121 is a deficient number, since it is larger than the sum of its proper divisors (95124923).

3900120121 is an equidigital number, since it uses as much as digits as its factorization.

3900120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95124922.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 3900120121 is about 62450.9417142768. The cubic root of 3900120121 is about 1574.0770769588.

The spelling of 3900120121 in words is "three billion, nine hundred million, one hundred twenty thousand, one hundred twenty-one".