1212222212009 has 2 divisors, whose sum is σ = 1212222212010. Its totient is φ = 1212222212008.

The previous prime is 1212222211943. The next prime is 1212222212023. The reversal of 1212222212009 is 9002122222121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 876086640025 + 336135571984 = 935995^2 + 579772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212222212009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1212222112009) 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, 606111106004 + 606111106005.

It is an arithmetic number, because the mean of its divisors is an integer number (606111106005).

Almost surely, 2^{1212222212009} is an apocalyptic number.

It is an amenable number.

1212222212009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212222212009 is an equidigital number, since it uses as much as digits as its factorization.

1212222212009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 1212222212009 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, two hundred twelve thousand, nine".