111220220021 has 8 divisors (see below), whose sum is σ = 111316469784. Its totient is φ = 111124016640.

The previous prime is 111220220017. The next prime is 111220220039. The reversal of 111220220021 is 120022022111.

It can be written as a sum of positive squares in 4 ways, for example, as 188650225 + 111031569796 = 13735^2 + 333214^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111220220021 - 2² = 111220220017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111220219978 and 111220220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220220051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6084131 + ... + 6102383.

It is an arithmetic number, because the mean of its divisors is an integer number (13914558723).

Almost surely, 2^111220220021 is an apocalyptic number.

It is an amenable number.

111220220021 is a deficient number, since it is larger than the sum of its proper divisors (96249763).

111220220021 is a wasteful number, since it uses less digits than its factorization.

111220220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23191.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 111220220021 its reverse (120022022111), we get a palindrome (231242242132).

The spelling of 111220220021 in words is "one hundred eleven billion, two hundred twenty million, two hundred twenty thousand, twenty-one".