19821347255 has 16 divisors (see below), whose sum is σ = 24127274304. Its totient is φ = 15629429760.

The previous prime is 19821347239. The next prime is 19821347267. The reversal of 19821347255 is 55274312891.

It is not a de Polignac number, because 19821347255 - 2⁴ = 19821347239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 2074469 + ... + 2084001.

It is an arithmetic number, because the mean of its divisors is an integer number (1507954644).

Almost surely, 2^19821347255 is an apocalyptic number.

19821347255 is a deficient number, since it is larger than the sum of its proper divisors (4305927049).

19821347255 is an equidigital number, since it uses as much as digits as its factorization.

19821347255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15466.

The product of its digits is 604800, while the sum is 47.

The spelling of 19821347255 in words is "nineteen billion, eight hundred twenty-one million, three hundred forty-seven thousand, two hundred fifty-five".