1200211022121 has 16 divisors (see below), whose sum is σ = 1643564265600. Its totient is φ = 778500073728.

The previous prime is 1200211022117. The next prime is 1200211022141. The reversal of 1200211022121 is 1212201120021.

It is not a de Polignac number, because 1200211022121 - 2² = 1200211022117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200211022121.

It is not an unprimeable number, because it can be changed into a prime (1200211022141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9701985 + ... + 9824913.

It is an arithmetic number, because the mean of its divisors is an integer number (102722766600).

Almost surely, 2^{1200211022121} is an apocalyptic number.

It is an amenable number.

1200211022121 is a deficient number, since it is larger than the sum of its proper divisors (443353243479).

1200211022121 is a wasteful number, since it uses less digits than its factorization.

1200211022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210928.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1200211022121 its reverse (1212201120021), we get a palindrome (2412412142142).

The spelling of 1200211022121 in words is "one trillion, two hundred billion, two hundred eleven million, twenty-two thousand, one hundred twenty-one".