1200022111111 has 4 divisors (see below), whose sum is σ = 1238732501824. Its totient is φ = 1161311720400.

The previous prime is 1200022111091. The next prime is 1200022111117. The reversal of 1200022111111 is 1111112200021.

It is a happy number.

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

It is not a de Polignac number, because 1200022111111 - 2²⁹ = 1199485240199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200022111091 and 1200022111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200022111117) 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, 19355195310 + ... + 19355195371.

It is an arithmetic number, because the mean of its divisors is an integer number (309683125456).

Almost surely, 2^{1200022111111} is an apocalyptic number.

1200022111111 is a deficient number, since it is larger than the sum of its proper divisors (38710390713).

1200022111111 is an equidigital number, since it uses as much as digits as its factorization.

1200022111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38710390712.

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

Adding to 1200022111111 its reverse (1111112200021), we get a palindrome (2311134311132).

The spelling of 1200022111111 in words is "one trillion, two hundred billion, twenty-two million, one hundred eleven thousand, one hundred eleven".