1101112221 has 24 divisors (see below), whose sum is σ = 1641134880. Its totient is φ = 656017120.

The previous prime is 1101112163. The next prime is 1101112231. The reversal of 1101112221 is 1222111011.

It is not a de Polignac number, because 1101112221 - 2¹⁸ = 1100850077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1101112197 and 1101112206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101112231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4290 + ... + 47123.

It is an arithmetic number, because the mean of its divisors is an integer number (68380620).

Almost surely, 2^1101112221 is an apocalyptic number.

1101112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1101112221 is a deficient number, since it is larger than the sum of its proper divisors (540022659).

1101112221 is a wasteful number, since it uses less digits than its factorization.

1101112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51497 (or 51486 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1101112221 is about 33183.0110297423. The cubic root of 1101112221 is about 1032.6279145108.

Adding to 1101112221 its reverse (1222111011), we get a palindrome (2323223232).

It can be divided in two parts, 11011 and 12221, that multiplied together give a palindrome (134565431).

The spelling of 1101112221 in words is "one billion, one hundred one million, one hundred twelve thousand, two hundred twenty-one".