2120109991 has 2 divisors, whose sum is σ = 2120109992. Its totient is φ = 2120109990.

The previous prime is 2120109977. The next prime is 2120110021. The reversal of 2120109991 is 1999010212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2120109991 - 2²¹ = 2118012839 is a prime.

It is a super-3 number, since 3×2120109991³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120109911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060054995 + 1060054996.

It is an arithmetic number, because the mean of its divisors is an integer number (1060054996).

Almost surely, 2^2120109991 is an apocalyptic number.

2120109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120109991 is an equidigital number, since it uses as much as digits as its factorization.

2120109991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 2120109991 is about 46044.6521433271. The cubic root of 2120109991 is about 1284.6538739825.

The spelling of 2120109991 in words is "two billion, one hundred twenty million, one hundred nine thousand, nine hundred ninety-one".