111221122221011 has 16 divisors (see below), whose sum is σ = 122545829568096. Its totient is φ = 100098900000000.

The previous prime is 111221122220947. The next prime is 111221122221101. The reversal of 111221122221011 is 110122221122111.

It is a happy number.

It is not a de Polignac number, because 111221122221011 - 2⁶ = 111221122220947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111221122220011) 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, 5944511 + ... + 16055511.

It is an arithmetic number, because the mean of its divisors is an integer number (7659114348006).

Almost surely, 2^{111221122221011} is an apocalyptic number.

111221122221011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111221122221011 is a deficient number, since it is larger than the sum of its proper divisors (11324707347085).

111221122221011 is a wasteful number, since it uses less digits than its factorization.

111221122221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10121014.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111221122221011 its reverse (110122221122111), we get a palindrome (221343343343122).

It can be divided in two parts, 111 and 221122221011, that added together give a palindrome (221122221122).

The spelling of 111221122221011 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, eleven".