111222100221 has 4 divisors (see below), whose sum is σ = 148296133632. Its totient is φ = 74148066812.

The previous prime is 111222100219. The next prime is 111222100261. The reversal of 111222100221 is 122001222111.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122001222111 = 3 ⋅40667074037.

It is a cyclic number.

It is not a de Polignac number, because 111222100221 - 2¹ = 111222100219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111222100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111222100261) 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, 18537016701 + ... + 18537016706.

It is an arithmetic number, because the mean of its divisors is an integer number (37074033408).

Almost surely, 2^111222100221 is an apocalyptic number.

It is an amenable number.

111222100221 is a deficient number, since it is larger than the sum of its proper divisors (37074033411).

111222100221 is an equidigital number, since it uses as much as digits as its factorization.

111222100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37074033410.

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

Adding to 111222100221 its reverse (122001222111), we get a palindrome (233223322332).

The spelling of 111222100221 in words is "one hundred eleven billion, two hundred twenty-two million, one hundred thousand, two hundred twenty-one".