1113121221 has 16 divisors (see below), whose sum is σ = 1494554880. Its totient is φ = 736896960.

The previous prime is 1113121201. The next prime is 1113121231. The reversal of 1113121221 is 1221213111.

It is not a de Polignac number, because 1113121221 - 2¹⁷ = 1112990149 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1113121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1113121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 563191 + ... + 565163.

It is an arithmetic number, because the mean of its divisors is an integer number (93409680).

Almost surely, 2^1113121221 is an apocalyptic number.

It is an amenable number.

1113121221 is a deficient number, since it is larger than the sum of its proper divisors (381433659).

1113121221 is a wasteful number, since it uses less digits than its factorization.

1113121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196.

The product of its digits is 24, while the sum is 15.

The square root of 1113121221 is about 33363.4713571595. The cubic root of 1113121221 is about 1036.3683802610.

Adding to 1113121221 its reverse (1221213111), we get a palindrome (2334334332).

The spelling of 1113121221 in words is "one billion, one hundred thirteen million, one hundred twenty-one thousand, two hundred twenty-one".