1200020001121 has 16 divisors (see below), whose sum is σ = 1213855948800. Its totient is φ = 1186282253520.

The previous prime is 1200020001091. The next prime is 1200020001133. The reversal of 1200020001121 is 1211000200021.

It is a cyclic number.

It is not a de Polignac number, because 1200020001121 - 2³³ = 1191430066529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200020001098 and 1200020001107.

It is not an unprimeable number, because it can be changed into a prime (1200020001221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23690980 + ... + 23741578.

It is an arithmetic number, because the mean of its divisors is an integer number (75865996800).

Almost surely, 2^{1200020001121} is an apocalyptic number.

It is an amenable number.

1200020001121 is a deficient number, since it is larger than the sum of its proper divisors (13835947679).

1200020001121 is a wasteful number, since it uses less digits than its factorization.

1200020001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51564.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1200020001121 its reverse (1211000200021), we get a palindrome (2411020201142).

The spelling of 1200020001121 in words is "one trillion, two hundred billion, twenty million, one thousand, one hundred twenty-one".