1121112222221 has 4 divisors (see below), whose sum is σ = 1125073749792. Its totient is φ = 1117150694652.

The previous prime is 1121112222161. The next prime is 1121112222233. The reversal of 1121112222221 is 1222222111211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121112222221 is a prime.

It is a super-2 number, since 2×1121112222221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121112222193 and 1121112222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121112228221) 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, 1980763361 + ... + 1980763926.

It is an arithmetic number, because the mean of its divisors is an integer number (281268437448).

Almost surely, 2^{1121112222221} is an apocalyptic number.

It is an amenable number.

1121112222221 is a deficient number, since it is larger than the sum of its proper divisors (3961527571).

1121112222221 is an equidigital number, since it uses as much as digits as its factorization.

1121112222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961527570.

The product of its digits is 128, while the sum is 20.

Adding to 1121112222221 its reverse (1222222111211), we get a palindrome (2343334333432).

It can be divided in two parts, 112111 and 2222221, that added together give a palindrome (2334332).

The spelling of 1121112222221 in words is "one trillion, one hundred twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".