1122221212111 has 4 divisors (see below), whose sum is σ = 1140618281224. Its totient is φ = 1103824143000.

The previous prime is 1122221212087. The next prime is 1122221212169. The reversal of 1122221212111 is 1112121222211.

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 1122221212111 - 2⁷ = 1122221211983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122221212811) 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, 9198534465 + ... + 9198534586.

It is an arithmetic number, because the mean of its divisors is an integer number (285154570306).

Almost surely, 2^{1122221212111} is an apocalyptic number.

1122221212111 is a deficient number, since it is larger than the sum of its proper divisors (18397069113).

1122221212111 is an equidigital number, since it uses as much as digits as its factorization.

1122221212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18397069112.

The product of its digits is 64, while the sum is 19.

Adding to 1122221212111 its reverse (1112121222211), we get a palindrome (2234342434322).

The spelling of 1122221212111 in words is "one trillion, one hundred twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, one hundred eleven".