111220221111 has 4 divisors (see below), whose sum is σ = 148293628152. Its totient is φ = 74146814072.

The previous prime is 111220221107. The next prime is 111220221121. The reversal of 111220221111 is 111122022111.

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 111220221111 - 2² = 111220221107 is a prime.

It is a super-4 number, since 4×111220221111⁴ (a number of 45 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220221121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18536703516 + ... + 18536703521.

It is an arithmetic number, because the mean of its divisors is an integer number (37073407038).

Almost surely, 2^111220221111 is an apocalyptic number.

111220221111 is a deficient number, since it is larger than the sum of its proper divisors (37073407041).

111220221111 is an equidigital number, since it uses as much as digits as its factorization.

111220221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37073407040.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111220221111 its reverse (111122022111), we get a palindrome (222342243222).

The spelling of 111220221111 in words is "one hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, one hundred eleven".