1321840019 has 2 divisors, whose sum is σ = 1321840020. Its totient is φ = 1321840018.

The previous prime is 1321839997. The next prime is 1321840027. The reversal of 1321840019 is 9100481231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321840019 - 2¹² = 1321835923 is a prime.

It is a super-2 number, since 2×1321840019² = 3494522071659840722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321839973 and 1321840000.

It is not a weakly prime, because it can be changed into another prime (1321840319) 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, 660920009 + 660920010.

It is an arithmetic number, because the mean of its divisors is an integer number (660920010).

Almost surely, 2^1321840019 is an apocalyptic number.

1321840019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321840019 is an equidigital number, since it uses as much as digits as its factorization.

1321840019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1321840019 is about 36357.1178588182. The cubic root of 1321840019 is about 1097.4707782929.

The spelling of 1321840019 in words is "one billion, three hundred twenty-one million, eight hundred forty thousand, nineteen".