111221220011 has 4 divisors (see below), whose sum is σ = 121332240024. Its totient is φ = 101110200000.

The previous prime is 111221219983. The next prime is 111221220013. The reversal of 111221220011 is 110022122111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110022122111 = 11 ⋅10002011101.

It is a cyclic number.

It is not a de Polignac number, because 111221220011 - 2¹⁰ = 111221218987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111221220013) 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 3 ways as a sum of consecutive naturals, for example, 5055509990 + ... + 5055510011.

It is an arithmetic number, because the mean of its divisors is an integer number (30333060006).

Almost surely, 2^111221220011 is an apocalyptic number.

111221220011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111221220011 is a deficient number, since it is larger than the sum of its proper divisors (10111020013).

111221220011 is a wasteful number, since it uses less digits than its factorization.

111221220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10111020012.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111221220011 its reverse (110022122111), we get a palindrome (221243342122).

The spelling of 111221220011 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, eleven".