121221842419 has 2 divisors, whose sum is σ = 121221842420. Its totient is φ = 121221842418.

The previous prime is 121221842393. The next prime is 121221842491. The reversal of 121221842419 is 914248122121.

Together with next prime (121221842491) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121221842419 - 2¹⁵ = 121221809651 is a prime.

It is a super-2 number, since 2×121221842419² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121221842719) 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, 60610921209 + 60610921210.

It is an arithmetic number, because the mean of its divisors is an integer number (60610921210).

Almost surely, 2^121221842419 is an apocalyptic number.

121221842419 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221842419 is an equidigital number, since it uses as much as digits as its factorization.

121221842419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The spelling of 121221842419 in words is "one hundred twenty-one billion, two hundred twenty-one million, eight hundred forty-two thousand, four hundred nineteen".