22155430321 has 2 divisors, whose sum is σ = 22155430322. Its totient is φ = 22155430320.

The previous prime is 22155430313. The next prime is 22155430333. The reversal of 22155430321 is 12303455122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13118266225 + 9037164096 = 114535^2 + 95064^2 .

It is a cyclic number.

It is not a de Polignac number, because 22155430321 - 2³ = 22155430313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22155430321.

It is not a weakly prime, because it can be changed into another prime (22155436321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11077715160 + 11077715161.

It is an arithmetic number, because the mean of its divisors is an integer number (11077715161).

Almost surely, 2^22155430321 is an apocalyptic number.

It is an amenable number.

22155430321 is a deficient number, since it is larger than the sum of its proper divisors (1).

22155430321 is an equidigital number, since it uses as much as digits as its factorization.

22155430321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 22155430321 its reverse (12303455122), we get a palindrome (34458885443).

The spelling of 22155430321 in words is "twenty-two billion, one hundred fifty-five million, four hundred thirty thousand, three hundred twenty-one".