1112110221221 has 4 divisors (see below), whose sum is σ = 1112112336972. Its totient is φ = 1112108105472.

The previous prime is 1112110221121. The next prime is 1112110221223. The reversal of 1112110221221 is 1221220112111.

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 689961148321 + 422149072900 = 830639^2 + 649730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1112110221221 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 1112110221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1112110221223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403535 + ... + 1545011.

It is an arithmetic number, because the mean of its divisors is an integer number (278028084243).

Almost surely, 2^{1112110221221} is an apocalyptic number.

It is an amenable number.

1112110221221 is a deficient number, since it is larger than the sum of its proper divisors (2115751).

1112110221221 is an equidigital number, since it uses as much as digits as its factorization.

1112110221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115750.

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

Adding to 1112110221221 its reverse (1221220112111), we get a palindrome (2333330333332).

It can be divided in two parts, 1112110 and 221221, that added together give a palindrome (1333331).

The spelling of 1112110221221 in words is "one trillion, one hundred twelve billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".