111220122110021 has 4 divisors (see below), whose sum is σ = 111260000249100. Its totient is φ = 111180243970944.

The previous prime is 111220122110003. The next prime is 111220122110047. The reversal of 111220122110021 is 120011221022111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99624632913796 + 11595489196225 = 9981214^2 + 3405215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111220122110021 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 (111220122110521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19939065356 + ... + 19939070933.

It is an arithmetic number, because the mean of its divisors is an integer number (27815000062275).

Almost surely, 2^{111220122110021} is an apocalyptic number.

It is an amenable number.

111220122110021 is a deficient number, since it is larger than the sum of its proper divisors (39878139079).

111220122110021 is an equidigital number, since it uses as much as digits as its factorization.

111220122110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39878139078.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111220122110021 its reverse (120011221022111), we get a palindrome (231231343132132).

The spelling of 111220122110021 in words is "one hundred eleven trillion, two hundred twenty billion, one hundred twenty-two million, one hundred ten thousand, twenty-one".