1821996219804 has 24 divisors (see below), whose sum is σ = 4436164709760. Its totient is φ = 580926330864.

The previous prime is 1821996219731. The next prime is 1821996219811. The reversal of 1821996219804 is 4089126991281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3300717514 + ... + 3300718065.

It is an arithmetic number, because the mean of its divisors is an integer number (184840196240).

Almost surely, 2^{1821996219804} is an apocalyptic number.

It is an amenable number.

1821996219804 is an abundant number, since it is smaller than the sum of its proper divisors (2614168489956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1821996219804 is a wasteful number, since it uses less digits than its factorization.

1821996219804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6601435609 (or 6601435607 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 60.

The spelling of 1821996219804 in words is "one trillion, eight hundred twenty-one billion, nine hundred ninety-six million, two hundred nineteen thousand, eight hundred four".