22320561 has 4 divisors (see below), whose sum is σ = 29760752. Its totient is φ = 14880372.

The previous prime is 22320559. The next prime is 22320563. The reversal of 22320561 is 16502322.

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 an interprime number because it is at equal distance from previous prime (22320559) and next prime (22320563).

It is not a de Polignac number, because 22320561 - 2¹ = 22320559 is a prime.

It is a super-3 number, since 3×22320561³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22320563) 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, 3720091 + ... + 3720096.

It is an arithmetic number, because the mean of its divisors is an integer number (7440188).

Almost surely, 2^22320561 is an apocalyptic number.

It is an amenable number.

22320561 is a deficient number, since it is larger than the sum of its proper divisors (7440191).

22320561 is an equidigital number, since it uses as much as digits as its factorization.

22320561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7440190.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 22320561 is about 4724.4640965934. The cubic root of 22320561 is about 281.5583222218.

Adding to 22320561 its reverse (16502322), we get a palindrome (38822883).

The spelling of 22320561 in words is "twenty-two million, three hundred twenty thousand, five hundred sixty-one".