381603891793221 has 20 divisors (see below), whose sum is σ = 594835051944672. Its totient is φ = 243341612156808.

The previous prime is 381603891793177. The next prime is 381603891793247. The reversal of 381603891793221 is 122397198306183.

381603891793221 is a `hidden beast` number, since 3 + 8 + 1 + 60 + 3 + 89 + 179 + 322 + 1 = 666.

It is not a de Polignac number, because 381603891793221 - 2¹⁰ = 381603891792197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381603891793261) 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, 102416501571 + ... + 102416505296.

Almost surely, 2^{381603891793221} is an apocalyptic number.

It is an amenable number.

381603891793221 is a deficient number, since it is larger than the sum of its proper divisors (213231160151451).

381603891793221 is a wasteful number, since it uses less digits than its factorization.

381603891793221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204833006902 (or 204833006893 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 63.

The spelling of 381603891793221 in words is "three hundred eighty-one trillion, six hundred three billion, eight hundred ninety-one million, seven hundred ninety-three thousand, two hundred twenty-one".