1213121333 has 2 divisors, whose sum is σ = 1213121334.
Its totient is φ = 1213121332.
The previous prime is 1213121323. The next prime is 1213121341. The reversal of 1213121333 is 3331213121.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 724578724 + 488542609 = 26918^2 + 22103^2
It is a cyclic number.
It is not a de Polignac number, because 1213121333 - 212 = 1213117237 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1213121323) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606560666 + 606560667.
It is an arithmetic number, because the mean of its divisors is an integer number (606560667).
Almost surely, 21213121333 is an apocalyptic number.
It is an amenable number.
1213121333 is a deficient number, since it is larger than the sum of its proper divisors (1).
1213121333 is an equidigital number, since it uses as much as digits as its factorization.
1213121333 is an evil number, because the sum of its binary digits is even.
The product of its digits is 324, while the sum is 20.
The square root of 1213121333 is about 34829.8913722107.
The cubic root of 1213121333 is about 1066.5177308439.
Adding to 1213121333 its reverse (3331213121), we get a palindrome (4544334454).
The spelling of 1213121333 in words is "one billion, two hundred thirteen million, one hundred twenty-one thousand, three hundred thirty-three".