2120712840 has 80 divisors (see below), whose sum is σ = 7127962380. Its totient is φ = 565522560.

The previous prime is 2120712833. The next prime is 2120712851. The reversal of 2120712840 is 482170212.

It can be written as a sum of positive squares in 2 ways, for example, as 1978292484 + 142420356 = 44478^2 + 11934^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 324031 + ... + 330510.

Almost surely, 2^2120712840 is an apocalyptic number.

2120712840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2120712840 is an abundant number, since it is smaller than the sum of its proper divisors (5007249540).

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

2120712840 is a wasteful number, since it uses less digits than its factorization.

2120712840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654564 (or 654551 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 2120712840 is about 46051.1980300187. The cubic root of 2120712840 is about 1284.7756253560.

The spelling of 2120712840 in words is "two billion, one hundred twenty million, seven hundred twelve thousand, eight hundred forty".