8221237 has 4 divisors (see below), whose sum is σ = 8360640. Its totient is φ = 8081836.

The previous prime is 8221229. The next prime is 8221249. The reversal of 8221237 is 7321228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8221237 - 2³ = 8221229 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 (8221267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69613 + ... + 69730.

It is an arithmetic number, because the mean of its divisors is an integer number (2090160).

Almost surely, 2^8221237 is an apocalyptic number.

It is an amenable number.

8221237 is a deficient number, since it is larger than the sum of its proper divisors (139403).

8221237 is a wasteful number, since it uses less digits than its factorization.

8221237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139402.

The product of its digits is 1344, while the sum is 25.

The square root of 8221237 is about 2867.2699558988. The cubic root of 8221237 is about 201.8269029823.

Subtracting from 8221237 its reverse (7321228), we obtain a palindrome (900009).

The spelling of 8221237 in words is "eight million, two hundred twenty-one thousand, two hundred thirty-seven".