2121021200 has 60 divisors (see below), whose sum is σ = 5127173328. Its totient is φ = 843177600.

The previous prime is 2121021197. The next prime is 2121021223. The reversal of 2121021200 is 21201212.

It is a happy 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, 48935 + ... + 81465.

Almost surely, 2^2121021200 is an apocalyptic number.

2121021200 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 2121021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2563586664).

2121021200 is an abundant number, since it is smaller than the sum of its proper divisors (3006152128).

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

2121021200 is a wasteful number, since it uses less digits than its factorization.

2121021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32712 (or 32701 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2121021200 is about 46054.5459211140. The cubic root of 2121021200 is about 1284.8378928169.

Adding to 2121021200 its reverse (21201212), we get a palindrome (2142222412).

The spelling of 2121021200 in words is "two billion, one hundred twenty-one million, twenty-one thousand, two hundred".