121212111947 has 2 divisors, whose sum is σ = 121212111948.
Its totient is φ = 121212111946.
The previous prime is 121212111931. The next prime is 121212111959. The reversal of 121212111947 is 749111212121.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 121212111947 - 24 = 121212111931 is a prime.
It is not a weakly prime, because it can be changed into another prime (121212111967) 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, 60606055973 + 60606055974.
It is an arithmetic number, because the mean of its divisors is an integer number (60606055974).
Almost surely, 2121212111947 is an apocalyptic number.
121212111947 is a deficient number, since it is larger than the sum of its proper divisors (1).
121212111947 is an equidigital number, since it uses as much as digits as its factorization.
121212111947 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 2016, while the sum is 32.
The spelling of 121212111947 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, nine hundred forty-seven".