867821379381 has 24 divisors (see below), whose sum is σ = 1369068186720. Its totient is φ = 525340015200.

The previous prime is 867821379343. The next prime is 867821379389. The reversal of 867821379381 is 183973128768.

It is not a de Polignac number, because 867821379381 - 2⁹ = 867821378869 is a prime.

It is a super-2 number, since 2×867821379381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867821379389) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5017330 + ... + 5187411.

It is an arithmetic number, because the mean of its divisors is an integer number (57044507780).

Almost surely, 2^867821379381 is an apocalyptic number.

It is an amenable number.

867821379381 is a deficient number, since it is larger than the sum of its proper divisors (501246807339).

867821379381 is a wasteful number, since it uses less digits than its factorization.

867821379381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10205617 (or 10205614 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The spelling of 867821379381 in words is "eight hundred sixty-seven billion, eight hundred twenty-one million, three hundred seventy-nine thousand, three hundred eighty-one".