121310111999 has 2 divisors, whose sum is σ = 121310112000. Its totient is φ = 121310111998.

The previous prime is 121310111983. The next prime is 121310112013. The reversal of 121310111999 is 999111013121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121310111999 - 2⁴ = 121310111983 is a prime.

It is a super-2 number, since 2×121310111999² (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 (121310111399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60655055999 + 60655056000.

It is an arithmetic number, because the mean of its divisors is an integer number (60655056000).

Almost surely, 2^121310111999 is an apocalyptic number.

121310111999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121310111999 is an equidigital number, since it uses as much as digits as its factorization.

121310111999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 38.

The spelling of 121310111999 in words is "one hundred twenty-one billion, three hundred ten million, one hundred eleven thousand, nine hundred ninety-nine".