22331221 has 8 divisors (see below), whose sum is σ = 24590304. Its totient is φ = 20110320.

The previous prime is 22331203. The next prime is 22331249. The reversal of 22331221 is 12213322.

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 22331221 - 2¹¹ = 22329173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22331195 and 22331204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22331291) 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, 8310 + ... + 10663.

It is an arithmetic number, because the mean of its divisors is an integer number (3073788).

Almost surely, 2^22331221 is an apocalyptic number.

It is an amenable number.

22331221 is a deficient number, since it is larger than the sum of its proper divisors (2259083).

22331221 is a wasteful number, since it uses less digits than its factorization.

22331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19091.

The product of its digits is 144, while the sum is 16.

The square root of 22331221 is about 4725.5921322095. The cubic root of 22331221 is about 281.6031379119.

Adding to 22331221 its reverse (12213322), we get a palindrome (34544543).

The spelling of 22331221 in words is "twenty-two million, three hundred thirty-one thousand, two hundred twenty-one".