1200221121111 has 4 divisors (see below), whose sum is σ = 1600294828152. Its totient is φ = 800147414072.

The previous prime is 1200221121097. The next prime is 1200221121173. The reversal of 1200221121111 is 1111211220021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1200221121111 - 2⁷ = 1200221120983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200221121511) 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, 200036853516 + ... + 200036853521.

It is an arithmetic number, because the mean of its divisors is an integer number (400073707038).

Almost surely, 2^{1200221121111} is an apocalyptic number.

1200221121111 is a deficient number, since it is larger than the sum of its proper divisors (400073707041).

1200221121111 is an equidigital number, since it uses as much as digits as its factorization.

1200221121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400073707040.

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

Adding to 1200221121111 its reverse (1111211220021), we get a palindrome (2311432341132).

The spelling of 1200221121111 in words is "one trillion, two hundred billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred eleven".