821209084803 has 20 divisors (see below), whose sum is σ = 1226794796128. Its totient is φ = 547450248240.

The previous prime is 821209084769. The next prime is 821209084807. The reversal of 821209084803 is 308480902128.

821209084803 is a `hidden beast` number, since 82 + 1 + 2 + 0 + 90 + 8 + 480 + 3 = 666.

It is not a de Polignac number, because 821209084803 - 2¹² = 821209080707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821209084807) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1909350 + ... + 2299572.

Almost surely, 2^821209084803 is an apocalyptic number.

821209084803 is a deficient number, since it is larger than the sum of its proper divisors (405585711325).

821209084803 is a wasteful number, since it uses less digits than its factorization.

821209084803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416216 (or 416207 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 821209084803 in words is "eight hundred twenty-one billion, two hundred nine million, eighty-four thousand, eight hundred three".