1212121333 has 2 divisors, whose sum is σ = 1212121334. Its totient is φ = 1212121332.

The previous prime is 1212121331. The next prime is 1212121357. The reversal of 1212121333 is 3331212121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627352209 + 584769124 = 25047^2 + 24182^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212121333 - 2¹ = 1212121331 is a prime.

Together with 1212121331, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1212121333.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212121331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606060666 + 606060667.

It is an arithmetic number, because the mean of its divisors is an integer number (606060667).

Almost surely, 2^1212121333 is an apocalyptic number.

It is an amenable number.

1212121333 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212121333 is an equidigital number, since it uses as much as digits as its factorization.

1212121333 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 1212121333 is about 34815.5329271289. The cubic root of 1212121333 is about 1066.2245997045.

Adding to 1212121333 its reverse (3331212121), we get a palindrome (4543333454).

The spelling of 1212121333 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, three hundred thirty-three".