2120238991 has 16 divisors (see below), whose sum is σ = 2320557120. Its totient is φ = 1925360640.

The previous prime is 2120238983. The next prime is 2120239003. The reversal of 2120238991 is 1998320212.

It is a cyclic number.

It is not a de Polignac number, because 2120238991 - 2³ = 2120238983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120238991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120238931) 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 15 ways as a sum of consecutive naturals, for example, 467551 + ... + 472063.

It is an arithmetic number, because the mean of its divisors is an integer number (145034820).

Almost surely, 2^2120238991 is an apocalyptic number.

2120238991 is a deficient number, since it is larger than the sum of its proper divisors (200318129).

2120238991 is a wasteful number, since it uses less digits than its factorization.

2120238991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5106.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 2120238991 is about 46046.0529361638. The cubic root of 2120238991 is about 1284.6799287610.

The spelling of 2120238991 in words is "two billion, one hundred twenty million, two hundred thirty-eight thousand, nine hundred ninety-one".