8223621 has 24 divisors (see below), whose sum is σ = 13061664. Its totient is φ = 4586400.

The previous prime is 8223601. The next prime is 8223653. The reversal of 8223621 is 1263228.

It is not a de Polignac number, because 8223621 - 2¹⁰ = 8222597 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8223591 and 8223600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8223601) 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, 5671 + ... + 6971.

It is an arithmetic number, because the mean of its divisors is an integer number (544236).

Almost surely, 2^8223621 is an apocalyptic number.

It is an amenable number.

8223621 is a deficient number, since it is larger than the sum of its proper divisors (4838043).

8223621 is a wasteful number, since it uses less digits than its factorization.

8223621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361 (or 1354 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 8223621 is about 2867.6856522290. The cubic root of 8223621 is about 201.8464097319.

Adding to 8223621 its reverse (1263228), we get a palindrome (9486849).

The spelling of 8223621 in words is "eight million, two hundred twenty-three thousand, six hundred twenty-one".