1031112221 has 4 divisors (see below), whose sum is σ = 1031324700. Its totient is φ = 1030899744.

The previous prime is 1031112211. The next prime is 1031112223. The reversal of 1031112221 is 1222111301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222111301 = 29 ⋅42141769.

It can be written as a sum of positive squares in 2 ways, for example, as 701508196 + 329604025 = 26486^2 + 18155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031112221 - 2¹⁰ = 1031111197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1031112196 and 1031112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031112223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98786 + ... + 108723.

It is an arithmetic number, because the mean of its divisors is an integer number (257831175).

Almost surely, 2^1031112221 is an apocalyptic number.

It is an amenable number.

1031112221 is a deficient number, since it is larger than the sum of its proper divisors (212479).

1031112221 is an equidigital number, since it uses as much as digits as its factorization.

1031112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212478.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1031112221 is about 32110.9361588852. The cubic root of 1031112221 is about 1010.2650093731.

Adding to 1031112221 its reverse (1222111301), we get a palindrome (2253223522).

The spelling of 1031112221 in words is "one billion, thirty-one million, one hundred twelve thousand, two hundred twenty-one".