2121211200 has 168 divisors, whose sum is σ = 6981781312. Its totient is φ = 563834880.

The previous prime is 2121211187. The next prime is 2121211201. The reversal of 2121211200 is 21121212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121211201) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2193117 + ... + 2194083.

Almost surely, 2^2121211200 is an apocalyptic number.

2121211200 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 2121211200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3490890656).

2121211200 is an abundant number, since it is smaller than the sum of its proper divisors (4860570112).

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

2121211200 is a wasteful number, since it uses less digits than its factorization.

2121211200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449 (or 1434 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2121211200 is about 46056.6086463170. The cubic root of 2121211200 is about 1284.8762567130.

Adding to 2121211200 its reverse (21121212), we get a palindrome (2142332412).

The spelling of 2121211200 in words is "two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred".