111220322021221 has 12 divisors (see below), whose sum is σ = 131499704929260. Its totient is φ = 93768889757760.

The previous prime is 111220322021213. The next prime is 111220322021231. The reversal of 111220322021221 is 122120223022111.

It can be written as a sum of positive squares in 2 ways, for example, as 31736660260900 + 79483661760321 = 5633530^2 + 8915361^2 .

It is not a de Polignac number, because 111220322021221 - 2³ = 111220322021213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111220322021192 and 111220322021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220322021231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18604935456 + ... + 18604941433.

It is an arithmetic number, because the mean of its divisors is an integer number (10958308744105).

Almost surely, 2^{111220322021221} is an apocalyptic number.

It is an amenable number.

111220322021221 is a deficient number, since it is larger than the sum of its proper divisors (20279382908039).

111220322021221 is an equidigital number, since it uses as much as digits as its factorization.

111220322021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37209876964 (or 37209876957 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 111220322021221 its reverse (122120223022111), we get a palindrome (233340545043332).

The spelling of 111220322021221 in words is "one hundred eleven trillion, two hundred twenty billion, three hundred twenty-two million, twenty-one thousand, two hundred twenty-one".