21022232321 has 2 divisors, whose sum is σ = 21022232322. Its totient is φ = 21022232320.

The previous prime is 21022232279. The next prime is 21022232359. The reversal of 21022232321 is 12323222012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17402886400 + 3619345921 = 131920^2 + 60161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022232321 is a prime.

It is a super-3 number, since 3×21022232321³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21022232293 and 21022232302.

It is not a weakly prime, because it can be changed into another prime (21022232221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511116160 + 10511116161.

It is an arithmetic number, because the mean of its divisors is an integer number (10511116161).

Almost surely, 2^21022232321 is an apocalyptic number.

It is an amenable number.

21022232321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022232321 is an equidigital number, since it uses as much as digits as its factorization.

21022232321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21022232321 its reverse (12323222012), we get a palindrome (33345454333).

The spelling of 21022232321 in words is "twenty-one billion, twenty-two million, two hundred thirty-two thousand, three hundred twenty-one".