2120340857 has 4 divisors (see below), whose sum is σ = 2127886836. Its totient is φ = 2112794880.

The previous prime is 2120340839. The next prime is 2120340863. The reversal of 2120340857 is 7580430212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 950427241 + 1169913616 = 30829^2 + 34204^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120340857 - 2⁸ = 2120340601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120340757) 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, 3772568 + ... + 3773129.

It is an arithmetic number, because the mean of its divisors is an integer number (531971709).

Almost surely, 2^2120340857 is an apocalyptic number.

It is an amenable number.

2120340857 is a deficient number, since it is larger than the sum of its proper divisors (7545979).

2120340857 is an equidigital number, since it uses as much as digits as its factorization.

2120340857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7545978.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 2120340857 is about 46047.1590546040. The cubic root of 2120340857 is about 1284.7005024023.

The spelling of 2120340857 in words is "two billion, one hundred twenty million, three hundred forty thousand, eight hundred fifty-seven".