1110111221 has 4 divisors (see below), whose sum is σ = 1110434700. Its totient is φ = 1109787744.

The previous prime is 1110111193. The next prime is 1110111241. The reversal of 1110111221 is 1221110111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1221110111 = 13 ⋅93931547.

It can be written as a sum of positive squares in 2 ways, for example, as 593458321 + 516652900 = 24361^2 + 22730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1110111221 - 2²⁶ = 1043002357 is a prime.

It is a super-2 number, since 2×1110111221² = 2464693845980221682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1110111241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156536 + ... + 163473.

It is an arithmetic number, because the mean of its divisors is an integer number (277608675).

Almost surely, 2^1110111221 is an apocalyptic number.

It is an amenable number.

1110111221 is a deficient number, since it is larger than the sum of its proper divisors (323479).

1110111221 is an equidigital number, since it uses as much as digits as its factorization.

1110111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323478.

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

The square root of 1110111221 is about 33318.3316058893. The cubic root of 1110111221 is about 1035.4333863026.

Adding to 1110111221 its reverse (1221110111), we get a palindrome (2331221332).

It can be divided in two parts, 11101 and 11221, that added together give a palindrome (22322).

The spelling of 1110111221 in words is "one billion, one hundred ten million, one hundred eleven thousand, two hundred twenty-one".