111112012122221 has 16 divisors (see below), whose sum is σ = 121524902194176. Its totient is φ = 100751308350000.

The previous prime is 111112012122197. The next prime is 111112012122263. The reversal of 111112012122221 is 122221210211111.

It is a happy number.

It is not a de Polignac number, because 111112012122221 - 2⁶ = 111112012122157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111112012122193 and 111112012122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111112012122271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4607546 + ... + 15602996.

It is an arithmetic number, because the mean of its divisors is an integer number (7595306387136).

Almost surely, 2^{111112012122221} is an apocalyptic number.

111112012122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111112012122221 is a deficient number, since it is larger than the sum of its proper divisors (10412890071955).

111112012122221 is a wasteful number, since it uses less digits than its factorization.

111112012122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10997824.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111112012122221 its reverse (122221210211111), we get a palindrome (233333222333332).

The spelling of 111112012122221 in words is "one hundred eleven trillion, one hundred twelve billion, twelve million, one hundred twenty-two thousand, two hundred twenty-one".