2156857920000 has 1200 divisors, whose sum is σ = 9003865590720. Its totient is φ = 486678528000.

The previous prime is 2156857919857. The next prime is 2156857920001. The reversal of 2156857920000 is 297586512.

2156857920000 is a `hidden beast` number, since 2 + 1 + 56 + 8 + 579 + 20 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1200).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (2156857920001) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1673279356 + ... + 1673280644.

Almost surely, 2^{2156857920000} is an apocalyptic number.

2156857920000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156857920000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4501932795360).

2156857920000 is an abundant number, since it is smaller than the sum of its proper divisors (6847007670720).

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

2156857920000 is an equidigital number, since it uses as much as digits as its factorization.

2156857920000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423 (or 1389 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 2156857920000 in words is "two trillion, one hundred fifty-six billion, eight hundred fifty-seven million, nine hundred twenty thousand".