1212122221213 has 2 divisors, whose sum is σ = 1212122221214. Its totient is φ = 1212122221212.

The previous prime is 1212122221207. The next prime is 1212122221223. The reversal of 1212122221213 is 3121222212121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664221740004 + 547900481209 = 814998^2 + 740203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212122221213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212122221223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606061110606 + 606061110607.

It is an arithmetic number, because the mean of its divisors is an integer number (606061110607).

Almost surely, 2^{1212122221213} is an apocalyptic number.

It is an amenable number.

1212122221213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212122221213 is an equidigital number, since it uses as much as digits as its factorization.

1212122221213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 22.

Adding to 1212122221213 its reverse (3121222212121), we get a palindrome (4333344433334).

The spelling of 1212122221213 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred thirteen".