381505117821 has 8 divisors (see below), whose sum is σ = 508732487904. Its totient is φ = 254307246480.

The previous prime is 381505117817. The next prime is 381505117867. The reversal of 381505117821 is 128711505183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 381505117821 - 2² = 381505117817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381505117871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7344490 + ... + 7396251.

It is an arithmetic number, because the mean of its divisors is an integer number (63591560988).

Almost surely, 2^381505117821 is an apocalyptic number.

It is an amenable number.

381505117821 is a deficient number, since it is larger than the sum of its proper divisors (127227370083).

381505117821 is a wasteful number, since it uses less digits than its factorization.

381505117821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14749371.

The product of its (nonzero) digits is 67200, while the sum is 42.

The spelling of 381505117821 in words is "three hundred eighty-one billion, five hundred five million, one hundred seventeen thousand, eight hundred twenty-one".