121000105819 has 2 divisors, whose sum is σ = 121000105820. Its totient is φ = 121000105818.

The previous prime is 121000105771. The next prime is 121000105909. The reversal of 121000105819 is 918501000121.

It is a weak prime.

It is an emirp because it is prime and its reverse (918501000121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121000105819 - 2¹³ = 121000097627 is a prime.

It is a super-2 number, since 2×121000105819² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121000105619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500052909 + 60500052910.

It is an arithmetic number, because the mean of its divisors is an integer number (60500052910).

Almost surely, 2^121000105819 is an apocalyptic number.

121000105819 is a deficient number, since it is larger than the sum of its proper divisors (1).

121000105819 is an equidigital number, since it uses as much as digits as its factorization.

121000105819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 28.

The spelling of 121000105819 in words is "one hundred twenty-one billion, one hundred five thousand, eight hundred nineteen".