1112222221 has 4 divisors (see below), whose sum is σ = 1213333344. Its totient is φ = 1011111100.

The previous prime is 1112222213. The next prime is 1112222227. The reversal of 1112222221 is 1222222111.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1112222221 - 2³ = 1112222213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1112222195 and 1112222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1112222227) 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, 50555545 + ... + 50555566.

It is an arithmetic number, because the mean of its divisors is an integer number (303333336).

Almost surely, 2^1112222221 is an apocalyptic number.

1112222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1112222221 is a deficient number, since it is larger than the sum of its proper divisors (101111123).

1112222221 is a wasteful number, since it uses less digits than its factorization.

1112222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101111122.

The product of its digits is 64, while the sum is 16.

The square root of 1112222221 is about 33349.9958170912. The cubic root of 1112222221 is about 1036.0893013092.

Adding to 1112222221 its reverse (1222222111), we get a palindrome (2334444332).

It can be divided in two parts, 11 and 12222221, that multiplied together give a palindrome (134444431).

The spelling of 1112222221 in words is "one billion, one hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".