1101112221221 has 4 divisors (see below), whose sum is σ = 1101299459244. Its totient is φ = 1100924983200.

The previous prime is 1101112221203. The next prime is 1101112221229. The reversal of 1101112221221 is 1221222111011.

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

It can be written as a sum of positive squares in 2 ways, for example, as 769762324321 + 331349896900 = 877361^2 + 575630^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101112221221 - 2¹⁴ = 1101112204837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1101112221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101112221229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93610190 + ... + 93621951.

It is an arithmetic number, because the mean of its divisors is an integer number (275324864811).

Almost surely, 2^{1101112221221} is an apocalyptic number.

It is an amenable number.

1101112221221 is a deficient number, since it is larger than the sum of its proper divisors (187238023).

1101112221221 is an equidigital number, since it uses as much as digits as its factorization.

1101112221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187238022.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1101112221221 its reverse (1221222111011), we get a palindrome (2322334332232).

It can be divided in two parts, 110111 and 2221221, that added together give a palindrome (2331332).

The spelling of 1101112221221 in words is "one trillion, one hundred one billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".