1121312221 has 8 divisors (see below), whose sum is σ = 1134516600. Its totient is φ = 1108165632.

The previous prime is 1121312219. The next prime is 1121312279. The reversal of 1121312221 is 1222131211.

It can be written as a sum of positive squares in 4 ways, for example, as 19802500 + 1101509721 = 4450^2 + 33189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1121312221 - 2¹ = 1121312219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121312195 and 1121312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121312021) 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 7 ways as a sum of consecutive naturals, for example, 25221 + ... + 53653.

It is an arithmetic number, because the mean of its divisors is an integer number (141814575).

Almost surely, 2^1121312221 is an apocalyptic number.

It is an amenable number.

1121312221 is a deficient number, since it is larger than the sum of its proper divisors (13204379).

1121312221 is a wasteful number, since it uses less digits than its factorization.

1121312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28895.

The product of its digits is 48, while the sum is 16.

The square root of 1121312221 is about 33486.0003732903. Note that the first 3 decimals coincide. The cubic root of 1121312221 is about 1038.9042394475.

Adding to 1121312221 its reverse (1222131211), we get a palindrome (2343443432).

The spelling of 1121312221 in words is "one billion, one hundred twenty-one million, three hundred twelve thousand, two hundred twenty-one".