111220201221 has 4 divisors (see below), whose sum is σ = 148293601632. Its totient is φ = 74146800812.

The previous prime is 111220201199. The next prime is 111220201223. The reversal of 111220201221 is 122102022111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111220201221 - 2⁵ = 111220201189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111220201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220201223) 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, 18536700201 + ... + 18536700206.

It is an arithmetic number, because the mean of its divisors is an integer number (37073400408).

Almost surely, 2^111220201221 is an apocalyptic number.

It is an amenable number.

111220201221 is a deficient number, since it is larger than the sum of its proper divisors (37073400411).

111220201221 is an equidigital number, since it uses as much as digits as its factorization.

111220201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37073400410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 111220201221 its reverse (122102022111), we get a palindrome (233322223332).

The spelling of 111220201221 in words is "one hundred eleven billion, two hundred twenty million, two hundred one thousand, two hundred twenty-one".