1200111021211 has 4 divisors (see below), whose sum is σ = 1206741469024. Its totient is φ = 1193480573400.

The previous prime is 1200111021191. The next prime is 1200111021217. The reversal of 1200111021211 is 1121201110021.

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 1200111021211 - 2²¹ = 1200108924059 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200111021191 and 1200111021200.

It is not an unprimeable number, because it can be changed into a prime (1200111021217) 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, 3315223635 + ... + 3315223996.

It is an arithmetic number, because the mean of its divisors is an integer number (301685367256).

Almost surely, 2^{1200111021211} is an apocalyptic number.

1200111021211 is a deficient number, since it is larger than the sum of its proper divisors (6630447813).

1200111021211 is an equidigital number, since it uses as much as digits as its factorization.

1200111021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6630447812.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1200111021211 its reverse (1121201110021), we get a palindrome (2321312131232).

The spelling of 1200111021211 in words is "one trillion, two hundred billion, one hundred eleven million, twenty-one thousand, two hundred eleven".