1821505057919 has 2 divisors, whose sum is σ = 1821505057920. Its totient is φ = 1821505057918.

The previous prime is 1821505057891. The next prime is 1821505057943. The reversal of 1821505057919 is 9197505051281.

It is a strong prime.

It is an emirp because it is prime and its reverse (9197505051281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1821505057919 - 2⁸ = 1821505057663 is a prime.

It is a super-2 number, since 2×1821505057919² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1821505017919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910752528959 + 910752528960.

It is an arithmetic number, because the mean of its divisors is an integer number (910752528960).

Almost surely, 2^{1821505057919} is an apocalyptic number.

1821505057919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821505057919 is an equidigital number, since it uses as much as digits as its factorization.

1821505057919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134000, while the sum is 53.

The spelling of 1821505057919 in words is "one trillion, eight hundred twenty-one billion, five hundred five million, fifty-seven thousand, nine hundred nineteen".