111122121211 has 16 divisors (see below), whose sum is σ = 114152924160. Its totient is φ = 108112384800.

The previous prime is 111122121169. The next prime is 111122121221. The reversal of 111122121211 is 112121221111.

It is a cyclic number.

It is not a de Polignac number, because 111122121211 - 2⁷ = 111122121083 is a prime.

It is a super-2 number, since 2×111122121211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111122121221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14060361 + ... + 14068261.

It is an arithmetic number, because the mean of its divisors is an integer number (7134557760).

Almost surely, 2^111122121211 is an apocalyptic number.

111122121211 is a deficient number, since it is larger than the sum of its proper divisors (3030802949).

111122121211 is an equidigital number, since it uses as much as digits as its factorization.

111122121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9186.

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

Adding to 111122121211 its reverse (112121221111), we get a palindrome (223243342322).

The spelling of 111122121211 in words is "one hundred eleven billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred eleven".