2156022720 has 504 divisors, whose sum is σ = 8262792720. Its totient is φ = 514252800.

The previous prime is 2156022703. The next prime is 2156022721. The reversal of 2156022720 is 272206512.

2156022720 is a `hidden beast` number, since 2 + 15 + 602 + 27 + 20 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156022721) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 52585900 + ... + 52585940.

It is an arithmetic number, because the mean of its divisors is an integer number (16394430).

Almost surely, 2^2156022720 is an apocalyptic number.

2156022720 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 2156022720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4131396360).

2156022720 is an abundant number, since it is smaller than the sum of its proper divisors (6106770000).

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

2156022720 is a wasteful number, since it uses less digits than its factorization.

2156022720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 2156022720 is about 46432.9917192507. The cubic root of 2156022720 is about 1291.8669200632.

The spelling of 2156022720 in words is "two billion, one hundred fifty-six million, twenty-two thousand, seven hundred twenty".