1200020211121 has 4 divisors (see below), whose sum is σ = 1238730540544. Its totient is φ = 1161309881700.

The previous prime is 1200020211107. The next prime is 1200020211127. The reversal of 1200020211121 is 1211120200021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1200020211121 - 2³³ = 1191430276529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200020211127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19355164665 + ... + 19355164726.

It is an arithmetic number, because the mean of its divisors is an integer number (309682635136).

Almost surely, 2^{1200020211121} is an apocalyptic number.

It is an amenable number.

1200020211121 is a deficient number, since it is larger than the sum of its proper divisors (38710329423).

1200020211121 is an equidigital number, since it uses as much as digits as its factorization.

1200020211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38710329422.

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

Adding to 1200020211121 its reverse (1211120200021), we get a palindrome (2411140411142).

It can be divided in two parts, 1200020 and 211121, that added together give a palindrome (1411141).

The spelling of 1200020211121 in words is "one trillion, two hundred billion, twenty million, two hundred eleven thousand, one hundred twenty-one".