21122203321 has 2 divisors, whose sum is σ = 21122203322. Its totient is φ = 21122203320.

The previous prime is 21122203313. The next prime is 21122203381. The reversal of 21122203321 is 12330222112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20336186025 + 786017296 = 142605^2 + 28036^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122203321 - 2³ = 21122203313 is a prime.

It is a super-2 number, since 2×21122203321² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21122203381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561101660 + 10561101661.

It is an arithmetic number, because the mean of its divisors is an integer number (10561101661).

Almost surely, 2^21122203321 is an apocalyptic number.

It is an amenable number.

21122203321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122203321 is an equidigital number, since it uses as much as digits as its factorization.

21122203321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21122203321 its reverse (12330222112), we get a palindrome (33452425433).

The spelling of 21122203321 in words is "twenty-one billion, one hundred twenty-two million, two hundred three thousand, three hundred twenty-one".