9231221 has 8 divisors (see below), whose sum is σ = 9828864. Its totient is φ = 8639680.

The previous prime is 9231217. The next prime is 9231247. The reversal of 9231221 is 1221329.

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 9231221 - 2² = 9231217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9231193 and 9231202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9231281) 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, 1826 + ... + 4668.

It is an arithmetic number, because the mean of its divisors is an integer number (1228608).

Almost surely, 2^9231221 is an apocalyptic number.

It is an amenable number.

9231221 is a deficient number, since it is larger than the sum of its proper divisors (597643).

9231221 is a wasteful number, since it uses less digits than its factorization.

9231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051.

The product of its digits is 216, while the sum is 20.

The square root of 9231221 is about 3038.2924480701. The cubic root of 9231221 is about 209.7746713867.

It can be divided in two parts, 92 and 31221, that added together give a palindrome (31313).

The spelling of 9231221 in words is "nine million, two hundred thirty-one thousand, two hundred twenty-one".