1212331213 has 2 divisors, whose sum is σ = 1212331214. Its totient is φ = 1212331212.

The previous prime is 1212331193. The next prime is 1212331223. The reversal of 1212331213 is 3121332121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1113089769 + 99241444 = 33363^2 + 9962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212331213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212331223) 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 as a sum of consecutive naturals, namely, 606165606 + 606165607.

It is an arithmetic number, because the mean of its divisors is an integer number (606165607).

Almost surely, 2^1212331213 is an apocalyptic number.

It is an amenable number.

1212331213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212331213 is an equidigital number, since it uses as much as digits as its factorization.

1212331213 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1212331213 is about 34818.5469685339. The cubic root of 1212331213 is about 1066.2861354321.

Adding to 1212331213 its reverse (3121332121), we get a palindrome (4333663334).

The spelling of 1212331213 in words is "one billion, two hundred twelve million, three hundred thirty-one thousand, two hundred thirteen".