19348464918221 has 2 divisors, whose sum is σ = 19348464918222. Its totient is φ = 19348464918220.

The previous prime is 19348464918191. The next prime is 19348464918269. The reversal of 19348464918221 is 12281946484391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14785909110025 + 4562555808196 = 3845245^2 + 2136014^2 .

It is a cyclic number.

It is not a de Polignac number, because 19348464918221 - 2¹⁴ = 19348464901837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19348464918421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9674232459110 + 9674232459111.

It is an arithmetic number, because the mean of its divisors is an integer number (9674232459111).

Almost surely, 2^{19348464918221} is an apocalyptic number.

It is an amenable number.

19348464918221 is a deficient number, since it is larger than the sum of its proper divisors (1).

19348464918221 is an equidigital number, since it uses as much as digits as its factorization.

19348464918221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23887872, while the sum is 62.

The spelling of 19348464918221 in words is "nineteen trillion, three hundred forty-eight billion, four hundred sixty-four million, nine hundred eighteen thousand, two hundred twenty-one".