1121111213 has 4 divisors (see below), whose sum is σ = 1122693180. Its totient is φ = 1119529248.

The previous prime is 1121111209. The next prime is 1121111227. The reversal of 1121111213 is 3121111211.

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 713798089 + 407313124 = 26717^2 + 20182^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121111213 - 2² = 1121111209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121111293) 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, 789920 + ... + 791337.

It is an arithmetic number, because the mean of its divisors is an integer number (280673295).

Almost surely, 2^1121111213 is an apocalyptic number.

It is an amenable number.

1121111213 is a deficient number, since it is larger than the sum of its proper divisors (1581967).

1121111213 is an equidigital number, since it uses as much as digits as its factorization.

1121111213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581966.

The product of its digits is 12, while the sum is 14.

The square root of 1121111213 is about 33482.9988650957. The cubic root of 1121111213 is about 1038.8421572611.

Adding to 1121111213 its reverse (3121111211), we get a palindrome (4242222424).

The spelling of 1121111213 in words is "one billion, one hundred twenty-one million, one hundred eleven thousand, two hundred thirteen".