2156120812000 has 96 divisors (see below), whose sum is σ = 5609211884640. Its totient is φ = 811716044800.

The previous prime is 2156120811991. The next prime is 2156120812019. The reversal of 2156120812000 is 2180216512.

It is a self number, because there is not a number n which added to its sum of digits gives 2156120812000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15785830 + ... + 15921829.

It is an arithmetic number, because the mean of its divisors is an integer number (58429290465).

Almost surely, 2^{2156120812000} is an apocalyptic number.

2156120812000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156120812000 is an abundant number, since it is smaller than the sum of its proper divisors (3453091072640).

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

2156120812000 is a wasteful number, since it uses less digits than its factorization.

2156120812000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31707701 (or 31707683 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The spelling of 2156120812000 in words is "two trillion, one hundred fifty-six billion, one hundred twenty million, eight hundred twelve thousand".