120990308921 has 4 divisors (see below), whose sum is σ = 124893222144. Its totient is φ = 117087395700.

The previous prime is 120990308891. The next prime is 120990308941. The reversal of 120990308921 is 129803099021.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 129803099021 = 17 ⋅7635476413.

It is a cyclic number.

It is not a de Polignac number, because 120990308921 - 2³⁰ = 119916567097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (120990308941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1951456565 + ... + 1951456626.

It is an arithmetic number, because the mean of its divisors is an integer number (31223305536).

Almost surely, 2^120990308921 is an apocalyptic number.

It is an amenable number.

120990308921 is a deficient number, since it is larger than the sum of its proper divisors (3902913223).

120990308921 is an equidigital number, since it uses as much as digits as its factorization.

120990308921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3902913222.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 120990308921 in words is "one hundred twenty billion, nine hundred ninety million, three hundred eight thousand, nine hundred twenty-one".