1111221115 has 4 divisors (see below), whose sum is σ = 1333465344. Its totient is φ = 888976888.

The previous prime is 1111221113. The next prime is 1111221119. The reversal of 1111221115 is 5111221111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1111221115 - 2¹ = 1111221113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111221113) 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, 111122107 + ... + 111122116.

It is an arithmetic number, because the mean of its divisors is an integer number (333366336).

Almost surely, 2^1111221115 is an apocalyptic number.

1111221115 is a deficient number, since it is larger than the sum of its proper divisors (222244229).

1111221115 is an equidigital number, since it uses as much as digits as its factorization.

1111221115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222244228.

The product of its digits is 20, while the sum is 16.

The square root of 1111221115 is about 33334.9833508283. The cubic root of 1111221115 is about 1035.7783482893.

Adding to 1111221115 its reverse (5111221111), we get a palindrome (6222442226).

The spelling of 1111221115 in words is "one billion, one hundred eleven million, two hundred twenty-one thousand, one hundred fifteen".