2121020120200 has 24 divisors (see below), whose sum is σ = 4931371779930. Its totient is φ = 848408048000.

The previous prime is 2121020120143. The next prime is 2121020120209. The reversal of 2121020120200 is 20210201212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1917288854244 + 203731265956 = 1384662^2 + 451366^2 .

It is not an unprimeable number, because it can be changed into a prime (2121020120209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5302550101 + ... + 5302550500.

Almost surely, 2^{2121020120200} is an apocalyptic number.

2121020120200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121020120200 is an abundant number, since it is smaller than the sum of its proper divisors (2810351659730).

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

2121020120200 is a wasteful number, since it uses less digits than its factorization.

2121020120200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605100617 (or 10605100608 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2121020120200 its reverse (20210201212), we get a palindrome (2141230321412).

The spelling of 2121020120200 in words is "two trillion, one hundred twenty-one billion, twenty million, one hundred twenty thousand, two hundred".