22556321 has 2 divisors, whose sum is σ = 22556322. Its totient is φ = 22556320.

The previous prime is 22556299. The next prime is 22556333. The reversal of 22556321 is 12365522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17430625 + 5125696 = 4175^2 + 2264^2 .

It is a cyclic number.

It is not a de Polignac number, because 22556321 - 2⁶ = 22556257 is a prime.

It is a super-3 number, since 3×22556321³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22556341) 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 as a sum of consecutive naturals, namely, 11278160 + 11278161.

It is an arithmetic number, because the mean of its divisors is an integer number (11278161).

Almost surely, 2^22556321 is an apocalyptic number.

It is an amenable number.

22556321 is a deficient number, since it is larger than the sum of its proper divisors (1).

22556321 is an equidigital number, since it uses as much as digits as its factorization.

22556321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 26.

The square root of 22556321 is about 4749.3495344099. The cubic root of 22556321 is about 282.5461683491.

The spelling of 22556321 in words is "twenty-two million, five hundred fifty-six thousand, three hundred twenty-one".