2100121121200 has 60 divisors (see below), whose sum is σ = 5046564847888. Its totient is φ = 839877984000.

The previous prime is 2100121121179. The next prime is 2100121121201. The reversal of 2100121121200 is 21211210012.

It is not an unprimeable number, because it can be changed into a prime (2100121121201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1450174 + ... + 2510626.

Almost surely, 2^{2100121121200} is an apocalyptic number.

2100121121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100121121200 is an abundant number, since it is smaller than the sum of its proper divisors (2946443726688).

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

2100121121200 is a wasteful number, since it uses less digits than its factorization.

2100121121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065422 (or 1065411 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2100121121200 its reverse (21211210012), we get a palindrome (2121332331212).

The spelling of 2100121121200 in words is "two trillion, one hundred billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred".