1821713065244 has 24 divisors (see below), whose sum is σ = 3256302943488. Its totient is φ = 891346454640.

The previous prime is 1821713065223. The next prime is 1821713065253. The reversal of 1821713065244 is 4425603171281.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1821713065195 and 1821713065204.

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 7 ways as a sum of consecutive naturals, for example, 590099 + ... + 1997909.

It is an arithmetic number, because the mean of its divisors is an integer number (135679289312).

Almost surely, 2^{1821713065244} is an apocalyptic number.

It is an amenable number.

1821713065244 is a deficient number, since it is larger than the sum of its proper divisors (1434589878244).

1821713065244 is a wasteful number, since it uses less digits than its factorization.

1821713065244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414745 (or 1414743 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 1821713065244 in words is "one trillion, eight hundred twenty-one billion, seven hundred thirteen million, sixty-five thousand, two hundred forty-four".