1821438367783 has 16 divisors (see below), whose sum is σ = 1930135422240. Its totient is φ = 1712914560000.

The previous prime is 1821438367751. The next prime is 1821438367789. The reversal of 1821438367783 is 3877638341281.

It is not a de Polignac number, because 1821438367783 - 2⁵ = 1821438367751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821438367789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132741363 + ... + 132755083.

It is an arithmetic number, because the mean of its divisors is an integer number (120633463890).

Almost surely, 2^{1821438367783} is an apocalyptic number.

1821438367783 is a deficient number, since it is larger than the sum of its proper divisors (108697054457).

1821438367783 is a wasteful number, since it uses less digits than its factorization.

1821438367783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19458.

The product of its digits is 32514048, while the sum is 61.

The spelling of 1821438367783 in words is "one trillion, eight hundred twenty-one billion, four hundred thirty-eight million, three hundred sixty-seven thousand, seven hundred eighty-three".