1821996219803 has 4 divisors (see below), whose sum is σ = 1821999483720. Its totient is φ = 1821992955888.

The previous prime is 1821996219731. The next prime is 1821996219811. The reversal of 1821996219803 is 3089126991281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1821996219803 - 2¹² = 1821996215707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1821996219403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559850 + ... + 1989327.

It is an arithmetic number, because the mean of its divisors is an integer number (455499870930).

Almost surely, 2^{1821996219803} is an apocalyptic number.

1821996219803 is a deficient number, since it is larger than the sum of its proper divisors (3263917).

1821996219803 is an equidigital number, since it uses as much as digits as its factorization.

1821996219803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263916.

The product of its (nonzero) digits is 3359232, while the sum is 59.

The spelling of 1821996219803 in words is "one trillion, eight hundred twenty-one billion, nine hundred ninety-six million, two hundred nineteen thousand, eight hundred three".