8201421 has 6 divisors (see below), whose sum is σ = 11846510. Its totient is φ = 5467608.

The previous prime is 8201419. The next prime is 8201441. The reversal of 8201421 is 1241028.

It can be written as a sum of positive squares in only one way, i.e., 5225796 + 2975625 = 2286^2 + 1725^2 .

It is not a de Polignac number, because 8201421 - 2¹ = 8201419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8201394 and 8201403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8201441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 455626 + ... + 455643.

Almost surely, 2^8201421 is an apocalyptic number.

It is an amenable number.

8201421 is a deficient number, since it is larger than the sum of its proper divisors (3645089).

8201421 is a wasteful number, since it uses less digits than its factorization.

8201421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911275 (or 911272 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 8201421 is about 2863.8123192695. The cubic root of 8201421 is about 201.6646151769.

Adding to 8201421 its reverse (1241028), we get a palindrome (9442449).

The spelling of 8201421 in words is "eight million, two hundred one thousand, four hundred twenty-one".