121212111973 has 2 divisors, whose sum is σ = 121212111974. Its totient is φ = 121212111972.

The previous prime is 121212111967. The next prime is 121212111989. The reversal of 121212111973 is 379111212121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120893203809 + 318908164 = 347697^2 + 17858^2 .

It is an emirp because it is prime and its reverse (379111212121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121212111973 - 2²⁵ = 121178557541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121212111673) 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, 60606055986 + 60606055987.

It is an arithmetic number, because the mean of its divisors is an integer number (60606055987).

Almost surely, 2^121212111973 is an apocalyptic number.

It is an amenable number.

121212111973 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212111973 is an equidigital number, since it uses as much as digits as its factorization.

121212111973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 31.

The spelling of 121212111973 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, nine hundred seventy-three".