8421001 has 8 divisors (see below), whose sum is σ = 8946720. Its totient is φ = 7898688.

The previous prime is 8420983. The next prime is 8421041. The reversal of 8421001 is 1001248.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8421001 - 2⁵ = 8420969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8421041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5790 + ... + 7096.

It is an arithmetic number, because the mean of its divisors is an integer number (1118340).

Almost surely, 2^8421001 is an apocalyptic number.

It is an amenable number.

8421001 is a deficient number, since it is larger than the sum of its proper divisors (525719).

8421001 is a wasteful number, since it uses less digits than its factorization.

8421001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 8421001 is about 2901.8961042739. The cubic root of 8421001 is about 203.4485378386.

Adding to 8421001 its reverse (1001248), we get a palindrome (9422249).

The spelling of 8421001 in words is "eight million, four hundred twenty-one thousand, one".