1213121233 has 12 divisors (see below), whose sum is σ = 1261189440. Its totient is φ = 1166804040.

The previous prime is 1213121209. The next prime is 1213121251. The reversal of 1213121233 is 3321213121.

It is not a de Polignac number, because 1213121233 - 2¹⁷ = 1212990161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213121233.

It is not an unprimeable number, because it can be changed into a prime (1213121263) 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 11 ways as a sum of consecutive naturals, for example, 156708 + ... + 164266.

It is an arithmetic number, because the mean of its divisors is an integer number (105099120).

Almost surely, 2^1213121233 is an apocalyptic number.

It is an amenable number.

1213121233 is a deficient number, since it is larger than the sum of its proper divisors (48068207).

1213121233 is an equidigital number, since it uses as much as digits as its factorization.

1213121233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7788 (or 7757 counting only the distinct ones).

The product of its digits is 216, while the sum is 19.

The square root of 1213121233 is about 34829.8899366622. The cubic root of 1213121233 is about 1066.5177015389.

Adding to 1213121233 its reverse (3321213121), we get a palindrome (4534334354).

The spelling of 1213121233 in words is "one billion, two hundred thirteen million, one hundred twenty-one thousand, two hundred thirty-three".