1111221011 has 4 divisors (see below), whose sum is σ = 1159534992. Its totient is φ = 1062907032.

The previous prime is 1111220987. The next prime is 1111221017. The reversal of 1111221011 is 1101221111.

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 1111221011 - 2¹⁰ = 1111219987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111220983 and 1111221001.

It is not an unprimeable number, because it can be changed into a prime (1111221017) 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, 24156956 + ... + 24157001.

It is an arithmetic number, because the mean of its divisors is an integer number (289883748).

Almost surely, 2^1111221011 is an apocalyptic number.

1111221011 is a deficient number, since it is larger than the sum of its proper divisors (48313981).

1111221011 is an equidigital number, since it uses as much as digits as its factorization.

1111221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48313980.

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 1111221011 is about 33334.9817909055. The cubic root of 1111221011 is about 1035.7783159762.

Adding to 1111221011 its reverse (1101221111), we get a palindrome (2212442122).

It can be divided in two parts, 11112 and 21011, that added together give a palindrome (32123).

The spelling of 1111221011 in words is "one billion, one hundred eleven million, two hundred twenty-one thousand, eleven".