381217884621 has 12 divisors (see below), whose sum is σ = 591276719232. Its totient is φ = 217838791128.

The previous prime is 381217884617. The next prime is 381217884647. The reversal of 381217884621 is 126488712183.

It is a happy number.

It is not a de Polignac number, because 381217884621 - 2² = 381217884617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381217884721) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1296659325 + ... + 1296659618.

It is an arithmetic number, because the mean of its divisors is an integer number (49273059936).

Almost surely, 2^381217884621 is an apocalyptic number.

It is an amenable number.

381217884621 is a deficient number, since it is larger than the sum of its proper divisors (210058834611).

381217884621 is a wasteful number, since it uses less digits than its factorization.

381217884621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593318960 (or 2593318953 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 51.

The spelling of 381217884621 in words is "three hundred eighty-one billion, two hundred seventeen million, eight hundred eighty-four thousand, six hundred twenty-one".