1212121212229 has 2 divisors, whose sum is σ = 1212121212230. Its totient is φ = 1212121212228.

The previous prime is 1212121212199. The next prime is 1212121212343. The reversal of 1212121212229 is 9222121212121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1036065444129 + 176055768100 = 1017873^2 + 419590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212121212229 - 2⁷ = 1212121212101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212121212197 and 1212121212206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212121222229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606060606114 + 606060606115.

It is an arithmetic number, because the mean of its divisors is an integer number (606060606115).

Almost surely, 2^{1212121212229} is an apocalyptic number.

It is an amenable number.

1212121212229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212121212229 is an equidigital number, since it uses as much as digits as its factorization.

1212121212229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 28.

The spelling of 1212121212229 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-nine".