19027392681821 has 2 divisors, whose sum is σ = 19027392681822. Its totient is φ = 19027392681820.

The previous prime is 19027392681809. The next prime is 19027392681827. The reversal of 19027392681821 is 12818629372091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14882968044025 + 4144424637796 = 3857845^2 + 2035786^2 .

It is an emirp because it is prime and its reverse (12818629372091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19027392681821 - 2³⁰ = 19026318939997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19027392681827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9513696340910 + 9513696340911.

It is an arithmetic number, because the mean of its divisors is an integer number (9513696340911).

Almost surely, 2^{19027392681821} is an apocalyptic number.

It is an amenable number.

19027392681821 is a deficient number, since it is larger than the sum of its proper divisors (1).

19027392681821 is an equidigital number, since it uses as much as digits as its factorization.

19027392681821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 59.

The spelling of 19027392681821 in words is "nineteen trillion, twenty-seven billion, three hundred ninety-two million, six hundred eighty-one thousand, eight hundred twenty-one".