8421402321 has 24 divisors (see below), whose sum is σ = 12818834496. Its totient is φ = 5316986400.

The previous prime is 8421402317. The next prime is 8421402323. The reversal of 8421402321 is 1232041248.

8421402321 is a `hidden beast` number, since 8 + 421 + 4 + 0 + 232 + 1 = 666.

It is not a de Polignac number, because 8421402321 - 2² = 8421402317 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (8421402323) 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, 180495 + ... + 222308.

It is an arithmetic number, because the mean of its divisors is an integer number (534118104).

Almost surely, 2^8421402321 is an apocalyptic number.

It is an amenable number.

8421402321 is a deficient number, since it is larger than the sum of its proper divisors (4397432175).

8421402321 is a wasteful number, since it uses less digits than its factorization.

8421402321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402933 (or 402930 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 8421402321 is about 91768.1988545051. The cubic root of 8421402321 is about 2034.5176971380.

Adding to 8421402321 its reverse (1232041248), we get a palindrome (9653443569).

The spelling of 8421402321 in words is "eight billion, four hundred twenty-one million, four hundred two thousand, three hundred twenty-one".