8361378421 has 24 divisors (see below), whose sum is σ = 9380525112. Its totient is φ = 7444694400.

The previous prime is 8361378409. The next prime is 8361378427. The reversal of 8361378421 is 1248731638.

It can be written as a sum of positive squares in 4 ways, for example, as 2887450225 + 5473928196 = 53735^2 + 73986^2 .

It is a de Polignac number, because none of the positive numbers 2^k-8361378421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8361378427) 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, 6547035 + ... + 6548311.

It is an arithmetic number, because the mean of its divisors is an integer number (390855213).

Almost surely, 2^8361378421 is an apocalyptic number.

It is an amenable number.

8361378421 is a deficient number, since it is larger than the sum of its proper divisors (1019146691).

8361378421 is a wasteful number, since it uses less digits than its factorization.

8361378421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373 (or 2362 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 8361378421 is about 91440.5731664014. The cubic root of 8361378421 is about 2029.6724637579.

The spelling of 8361378421 in words is "eight billion, three hundred sixty-one million, three hundred seventy-eight thousand, four hundred twenty-one".