2120840847 has 32 divisors (see below), whose sum is σ = 3298924800. Its totient is φ = 1344730464.

The previous prime is 2120840809. The next prime is 2120840957. The reversal of 2120840847 is 7480480212.

2120840847 is a `hidden beast` number, since 2 + 1 + 208 + 408 + 47 = 666.

It is not a de Polignac number, because 2120840847 - 2⁶ = 2120840783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120840647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32248 + ... + 72674.

It is an arithmetic number, because the mean of its divisors is an integer number (103091400).

Almost surely, 2^2120840847 is an apocalyptic number.

2120840847 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2120840847 is a deficient number, since it is larger than the sum of its proper divisors (1178083953).

2120840847 is a wasteful number, since it uses less digits than its factorization.

2120840847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40532 (or 40526 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 2120840847 is about 46052.5878425958. The cubic root of 2120840847 is about 1284.8014746776.

The spelling of 2120840847 in words is "two billion, one hundred twenty million, eight hundred forty thousand, eight hundred forty-seven".