111210201221 has 4 divisors (see below), whose sum is σ = 127097372832. Its totient is φ = 95323029612.

The previous prime is 111210201217. The next prime is 111210201241. The reversal of 111210201221 is 122102012111.

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 111210201221 - 2² = 111210201217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111210201196 and 111210201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111210201241) 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, 7943585795 + ... + 7943585808.

It is an arithmetic number, because the mean of its divisors is an integer number (31774343208).

Almost surely, 2^111210201221 is an apocalyptic number.

It is an amenable number.

111210201221 is a deficient number, since it is larger than the sum of its proper divisors (15887171611).

111210201221 is an equidigital number, since it uses as much as digits as its factorization.

111210201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15887171610.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111210201221 its reverse (122102012111), we get a palindrome (233312213332).

The spelling of 111210201221 in words is "one hundred eleven billion, two hundred ten million, two hundred one thousand, two hundred twenty-one".