1111112221 has 8 divisors (see below), whose sum is σ = 1167206400. Its totient is φ = 1055666832.

The previous prime is 1111112203. The next prime is 1111112227. The reversal of 1111112221 is 1222111111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1111112221 - 2⁹ = 1111111709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111112227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158685 + ... + 165538.

It is an arithmetic number, because the mean of its divisors is an integer number (145900800).

Almost surely, 2^1111112221 is an apocalyptic number.

It is an amenable number.

1111112221 is a deficient number, since it is larger than the sum of its proper divisors (56094179).

1111112221 is a wasteful number, since it uses less digits than its factorization.

1111112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324395.

The product of its digits is 8, while the sum is 13.

The square root of 1111112221 is about 33333.3499816625. The cubic root of 1111112221 is about 1035.7445135195.

Adding to 1111112221 its reverse (1222111111), we get a palindrome (2333223332).

It can be divided in two parts, 11111 and 12221, that multiplied together give a palindrome (135787531).

The spelling of 1111112221 in words is "one billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty-one".