2156021200 has 60 divisors (see below), whose sum is σ = 5452483360. Its totient is φ = 817015680.

The previous prime is 2156021171. The next prime is 2156021227. The reversal of 2156021200 is 21206512.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134244 + ... + 149443.

Almost surely, 2^2156021200 is an apocalyptic number.

2156021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156021200 is an abundant number, since it is smaller than the sum of its proper divisors (3296462160).

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

2156021200 is a wasteful number, since it uses less digits than its factorization.

2156021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283724 (or 283713 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2156021200 is about 46432.9753515753. The cubic root of 2156021200 is about 1291.8666164737.

Adding to 2156021200 its reverse (21206512), we get a palindrome (2177227712).

The spelling of 2156021200 in words is "two billion, one hundred fifty-six million, twenty-one thousand, two hundred".