1112222112221 has 16 divisors (see below), whose sum is σ = 1225482293376. Its totient is φ = 1000989000000.

The previous prime is 1112222112191. The next prime is 1112222112223. The reversal of 1112222112221 is 1222112222111.

It is a de Polignac number, because none of the positive numbers 2^k-1112222112221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1112222112193 and 1112222112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1112222112223) 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, 10949456 + ... + 11050566.

It is an arithmetic number, because the mean of its divisors is an integer number (76592643336).

Almost surely, 2^{1112222112221} is an apocalyptic number.

1112222112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1112222112221 is a deficient number, since it is larger than the sum of its proper divisors (113260181155).

1112222112221 is a wasteful number, since it uses less digits than its factorization.

1112222112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111124.

The product of its digits is 128, while the sum is 20.

Adding to 1112222112221 its reverse (1222112222111), we get a palindrome (2334334334332).

The spelling of 1112222112221 in words is "one trillion, one hundred twelve billion, two hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".