2120301991 has 2 divisors, whose sum is σ = 2120301992. Its totient is φ = 2120301990.

The previous prime is 2120301977. The next prime is 2120302099. The reversal of 2120301991 is 1991030212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2120301991 - 2⁵ = 2120301959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120301191) 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 as a sum of consecutive naturals, namely, 1060150995 + 1060150996.

It is an arithmetic number, because the mean of its divisors is an integer number (1060150996).

Almost surely, 2^2120301991 is an apocalyptic number.

2120301991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120301991 is an equidigital number, since it uses as much as digits as its factorization.

2120301991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 2120301991 is about 46046.7370288059. The cubic root of 2120301991 is about 1284.6926528036.

The spelling of 2120301991 in words is "two billion, one hundred twenty million, three hundred one thousand, nine hundred ninety-one".