2120810856 has 32 divisors (see below), whose sum is σ = 5581082400. Its totient is φ = 669729600.

The previous prime is 2120810849. The next prime is 2120810863. The reversal of 2120810856 is 6580180212.

It is an interprime number because it is at equal distance from previous prime (2120810849) and next prime (2120810863).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2324995 + ... + 2325906.

It is an arithmetic number, because the mean of its divisors is an integer number (174408825).

Almost surely, 2^2120810856 is an apocalyptic number.

It is an amenable number.

2120810856 is an abundant number, since it is smaller than the sum of its proper divisors (3460271544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2120810856 is a wasteful number, since it uses less digits than its factorization.

2120810856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4650929 (or 4650925 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 2120810856 is about 46052.2622245640. The cubic root of 2120810856 is about 1284.7954184849.

The spelling of 2120810856 in words is "two billion, one hundred twenty million, eight hundred ten thousand, eight hundred fifty-six".