22320321 has 4 divisors (see below), whose sum is σ = 29760432. Its totient is φ = 14880212.

The previous prime is 22320317. The next prime is 22320391. The reversal of 22320321 is 12302322.

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 22320321 - 2² = 22320317 is a prime.

It is a super-3 number, since 3×22320321³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22320321.

It is not an unprimeable number, because it can be changed into a prime (22320301) 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, 3720051 + ... + 3720056.

It is an arithmetic number, because the mean of its divisors is an integer number (7440108).

Almost surely, 2^22320321 is an apocalyptic number.

It is an amenable number.

22320321 is a deficient number, since it is larger than the sum of its proper divisors (7440111).

22320321 is an equidigital number, since it uses as much as digits as its factorization.

22320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7440110.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 22320321 is about 4724.4386968189. The cubic root of 22320321 is about 281.5573130740.

Adding to 22320321 its reverse (12302322), we get a palindrome (34622643).

The spelling of 22320321 in words is "twenty-two million, three hundred twenty thousand, three hundred twenty-one".