1112221021 has 4 divisors (see below), whose sum is σ = 1150573500. Its totient is φ = 1073868544.

The previous prime is 1112220973. The next prime is 1112221027. The reversal of 1112221021 is 1201222111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1201222111 = 191 ⋅6289121.

It can be written as a sum of positive squares in 2 ways, for example, as 277588921 + 834632100 = 16661^2 + 28890^2 .

It is a cyclic number.

It is not a de Polignac number, because 1112221021 - 2⁹ = 1112220509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1112220992 and 1112221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1112221027) 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, 19176196 + ... + 19176253.

It is an arithmetic number, because the mean of its divisors is an integer number (287643375).

Almost surely, 2^1112221021 is an apocalyptic number.

It is an amenable number.

1112221021 is a deficient number, since it is larger than the sum of its proper divisors (38352479).

1112221021 is an equidigital number, since it uses as much as digits as its factorization.

1112221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38352478.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1112221021 is about 33349.9778260796. The cubic root of 1112221021 is about 1036.0889286895.

Adding to 1112221021 its reverse (1201222111), we get a palindrome (2313443132).

The spelling of 1112221021 in words is "one billion, one hundred twelve million, two hundred twenty-one thousand, twenty-one".