22313221 has 4 divisors (see below), whose sum is σ = 25500832. Its totient is φ = 19125612.

The previous prime is 22313219. The next prime is 22313227. The reversal of 22313221 is 12231322.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12231322 = 2 ⋅6115661.

It is a cyclic number.

It is not a de Polignac number, because 22313221 - 2¹ = 22313219 is a prime.

It is a super-3 number, since 3×22313221³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22313195 and 22313204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22313227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1593795 + ... + 1593808.

It is an arithmetic number, because the mean of its divisors is an integer number (6375208).

Almost surely, 2^22313221 is an apocalyptic number.

It is an amenable number.

22313221 is a deficient number, since it is larger than the sum of its proper divisors (3187611).

22313221 is an equidigital number, since it uses as much as digits as its factorization.

22313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3187610.

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

The square root of 22313221 is about 4723.6872250394. The cubic root of 22313221 is about 281.5274558432.

Adding to 22313221 its reverse (12231322), we get a palindrome (34544543).

The spelling of 22313221 in words is "twenty-two million, three hundred thirteen thousand, two hundred twenty-one".