2121200000 has 96 divisors (see below), whose sum is σ = 5282943120. Its totient is φ = 848320000.

The previous prime is 2121199999. The next prime is 2121200021. The reversal of 2121200000 is 21212.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 397349 + ... + 402651.

Almost surely, 2^2121200000 is an apocalyptic number.

2121200000 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 2121200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2641471560).

2121200000 is an abundant number, since it is smaller than the sum of its proper divisors (3161743120).

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

2121200000 is an frugal number, since it uses more digits than its factorization.

2121200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5342 (or 5310 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 2121200000 is about 46056.4870566569. The cubic root of 2121200000 is about 1284.8739953258.

Adding to 2121200000 its reverse (21212), we get a palindrome (2121221212).

2121200000 divided by its reverse (21212) gives a 5-th power (100000 = 10⁵).

The spelling of 2121200000 in words is "two billion, one hundred twenty-one million, two hundred thousand".