1213112123 has 2 divisors, whose sum is σ = 1213112124. Its totient is φ = 1213112122.

The previous prime is 1213112113. The next prime is 1213112143. The reversal of 1213112123 is 3212113121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213112123 - 2¹⁰ = 1213111099 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213112113) 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 as a sum of consecutive naturals, namely, 606556061 + 606556062.

It is an arithmetic number, because the mean of its divisors is an integer number (606556062).

Almost surely, 2^1213112123 is an apocalyptic number.

1213112123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213112123 is an equidigital number, since it uses as much as digits as its factorization.

1213112123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 17.

The square root of 1213112123 is about 34829.7591579385. The cubic root of 1213112123 is about 1066.5150318412.

Adding to 1213112123 its reverse (3212113121), we get a palindrome (4425225244).

The spelling of 1213112123 in words is "one billion, two hundred thirteen million, one hundred twelve thousand, one hundred twenty-three".