111222112221 has 96 divisors (see below), whose sum is σ = 187478928000. Its totient is φ = 62890007040.

The previous prime is 111222112219. The next prime is 111222112223. The reversal of 111222112221 is 122211222111.

111222112221 is a `hidden beast` number, since 111 + 222 + 112 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (111222112219) and next prime (111222112223).

It is not a de Polignac number, because 111222112221 - 2¹ = 111222112219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111222112194 and 111222112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111222112223) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15824310 + ... + 15831336.

It is an arithmetic number, because the mean of its divisors is an integer number (1952905500).

Almost surely, 2^111222112221 is an apocalyptic number.

111222112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111222112221 is a deficient number, since it is larger than the sum of its proper divisors (76256815779).

111222112221 is a wasteful number, since it uses less digits than its factorization.

111222112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7259 (or 7256 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 111222112221 its reverse (122211222111), we get a palindrome (233433334332).

It can be divided in two parts, 11 and 1222112221, that multiplied together give a palindrome (13443234431).

The spelling of 111222112221 in words is "one hundred eleven billion, two hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".