111220032221 has 4 divisors (see below), whose sum is σ = 111796302012. Its totient is φ = 110643762432.

The previous prime is 111220032113. The next prime is 111220032241. The reversal of 111220032221 is 122230022111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122230022111 = 10457 ⋅11688823.

It can be written as a sum of positive squares in 2 ways, for example, as 65528832196 + 45691200025 = 255986^2 + 213755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111220032221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111220032221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220032241) 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, 288134606 + ... + 288134991.

It is an arithmetic number, because the mean of its divisors is an integer number (27949075503).

Almost surely, 2^111220032221 is an apocalyptic number.

It is an amenable number.

111220032221 is a deficient number, since it is larger than the sum of its proper divisors (576269791).

111220032221 is an equidigital number, since it uses as much as digits as its factorization.

111220032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576269790.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 111220032221 its reverse (122230022111), we get a palindrome (233450054332).

The spelling of 111220032221 in words is "one hundred eleven billion, two hundred twenty million, thirty-two thousand, two hundred twenty-one".