2120121200 has 120 divisors (see below), whose sum is σ = 5206928640. Its totient is φ = 829382400.

The previous prime is 2120121197. The next prime is 2120121233. The reversal of 2120121200 is 21210212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6405035 + ... + 6405365.

It is an arithmetic number, because the mean of its divisors is an integer number (43391072).

Almost surely, 2^2120121200 is an apocalyptic number.

2120121200 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 2120121200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2603464320).

2120121200 is an abundant number, since it is smaller than the sum of its proper divisors (3086807440).

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

2120121200 is a wasteful number, since it uses less digits than its factorization.

2120121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 644 counting only the distinct ones).

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

The square root of 2120121200 is about 46044.7738619705. The cubic root of 2120121200 is about 1284.6561379625.

Adding to 2120121200 its reverse (21210212), we get a palindrome (2141331412).

The spelling of 2120121200 in words is "two billion, one hundred twenty million, one hundred twenty-one thousand, two hundred".