1200211121221 has 32 divisors (see below), whose sum is σ = 1470571135488. Its totient is φ = 957172930560.

The previous prime is 1200211121189. The next prime is 1200211121257. The reversal of 1200211121221 is 1221211120021.

It is not a de Polignac number, because 1200211121221 - 2⁵ = 1200211121189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200211121195 and 1200211121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200211121321) 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 31 ways as a sum of consecutive naturals, for example, 1954771 + ... + 2494303.

It is an arithmetic number, because the mean of its divisors is an integer number (45955347984).

Almost surely, 2^{1200211121221} is an apocalyptic number.

It is an amenable number.

1200211121221 is a deficient number, since it is larger than the sum of its proper divisors (270360014267).

1200211121221 is a wasteful number, since it uses less digits than its factorization.

1200211121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539941.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1200211121221 its reverse (1221211120021), we get a palindrome (2421422241242).

The spelling of 1200211121221 in words is "one trillion, two hundred billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".