121212111959 has 2 divisors, whose sum is σ = 121212111960. Its totient is φ = 121212111958.

The previous prime is 121212111947. The next prime is 121212111967. The reversal of 121212111959 is 959111212121.

It is a strong prime.

It is an emirp because it is prime and its reverse (959111212121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121212111959 is a prime.

It is a super-2 number, since 2×121212111959² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121212111989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606055979 + 60606055980.

It is an arithmetic number, because the mean of its divisors is an integer number (60606055980).

Almost surely, 2^121212111959 is an apocalyptic number.

121212111959 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212111959 is an equidigital number, since it uses as much as digits as its factorization.

121212111959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 35.

The spelling of 121212111959 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, nine hundred fifty-nine".