121212112019 has 2 divisors, whose sum is σ = 121212112020.
Its totient is φ = 121212112018.
The previous prime is 121212112001. The next prime is 121212112051. The reversal of 121212112019 is 910211212121.
It is a happy number.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 121212112019 - 28 = 121212111763 is a prime.
It is a super-2 number, since 2×1212121120192 (a number of 23 digits) contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 121212111985 and 121212112003.
It is not a weakly prime, because it can be changed into another prime (121212112079) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606056009 + 60606056010.
It is an arithmetic number, because the mean of its divisors is an integer number (60606056010).
Almost surely, 2121212112019 is an apocalyptic number.
121212112019 is a deficient number, since it is larger than the sum of its proper divisors (1).
121212112019 is an equidigital number, since it uses as much as digits as its factorization.
121212112019 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 144, while the sum is 23.
The spelling of 121212112019 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twelve thousand, nineteen".