111121122220111 has 64 divisors (see below), whose sum is σ = 122753117454336. Its totient is φ = 100134254937600.

The previous prime is 111121122220067. The next prime is 111121122220117. The reversal of 111121122220111 is 111022221121111.

It is a cyclic number.

It is not a de Polignac number, because 111121122220111 - 2¹⁷ = 111121122089039 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 (111121122220117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18030359116 + ... + 18030365278.

It is an arithmetic number, because the mean of its divisors is an integer number (1918017460224).

Almost surely, 2^{111121122220111} is an apocalyptic number.

111121122220111 is a deficient number, since it is larger than the sum of its proper divisors (11631995234225).

111121122220111 is a wasteful number, since it uses less digits than its factorization.

111121122220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7292.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111121122220111 its reverse (111022221121111), we get a palindrome (222143343341222).

The spelling of 111121122220111 in words is "one hundred eleven trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, one hundred eleven".