1200211121121 has 4 divisors (see below), whose sum is σ = 1600281494832. Its totient is φ = 800140747412.

The previous prime is 1200211121101. The next prime is 1200211121189. The reversal of 1200211121121 is 1211211120021.

It is a happy number.

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 1200211121121 - 2¹⁴ = 1200211104737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200211121121.

It is not an unprimeable number, because it can be changed into a prime (1200211121101) 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 3 ways as a sum of consecutive naturals, for example, 200035186851 + ... + 200035186856.

It is an arithmetic number, because the mean of its divisors is an integer number (400070373708).

Almost surely, 2^{1200211121121} is an apocalyptic number.

It is an amenable number.

1200211121121 is a deficient number, since it is larger than the sum of its proper divisors (400070373711).

1200211121121 is an equidigital number, since it uses as much as digits as its factorization.

1200211121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400070373710.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1200211121121 its reverse (1211211120021), we get a palindrome (2411422241142).

The spelling of 1200211121121 in words is "one trillion, two hundred billion, two hundred eleven million, one hundred twenty-one thousand, one hundred twenty-one".