1122112121111 has 4 divisors (see below), whose sum is σ = 1122124243512. Its totient is φ = 1122099998712.

The previous prime is 1122112121077. The next prime is 1122112121131. The reversal of 1122112121111 is 1111212112211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1122112121111 is a prime.

It is a super-2 number, since 2×1122112121111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1122112121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122112121131) 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, 5921276 + ... + 6107841.

It is an arithmetic number, because the mean of its divisors is an integer number (280531060878).

Almost surely, 2^{1122112121111} is an apocalyptic number.

1122112121111 is a deficient number, since it is larger than the sum of its proper divisors (12122401).

1122112121111 is an equidigital number, since it uses as much as digits as its factorization.

1122112121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12122400.

The product of its digits is 16, while the sum is 17.

Adding to 1122112121111 its reverse (1111212112211), we get a palindrome (2233324233322).

It can be divided in two parts, 112211 and 2121111, that added together give a palindrome (2233322).

The spelling of 1122112121111 in words is "one trillion, one hundred twenty-two billion, one hundred twelve million, one hundred twenty-one thousand, one hundred eleven".