2120831818 has 48 divisors (see below), whose sum is σ = 3777732000. Its totient is φ = 890114400.

The previous prime is 2120831809. The next prime is 2120831827. The reversal of 2120831818 is 8181380212.

It is an interprime number because it is at equal distance from previous prime (2120831809) and next prime (2120831827).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2017393 + ... + 2018443.

It is an arithmetic number, because the mean of its divisors is an integer number (78702750).

Almost surely, 2^2120831818 is an apocalyptic number.

2120831818 is a deficient number, since it is larger than the sum of its proper divisors (1656900182).

2120831818 is a wasteful number, since it uses less digits than its factorization.

2120831818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475 (or 1468 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 2120831818 is about 46052.4898132555. The cubic root of 2120831818 is about 1284.7996514245.

The spelling of 2120831818 in words is "two billion, one hundred twenty million, eight hundred thirty-one thousand, eight hundred eighteen".