21233110321 has 2 divisors, whose sum is σ = 21233110322. Its totient is φ = 21233110320.

The previous prime is 21233110289. The next prime is 21233110331. The reversal of 21233110321 is 12301133212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11644783921 + 9588326400 = 107911^2 + 97920^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233110321 - 2⁵ = 21233110289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21233110331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616555160 + 10616555161.

It is an arithmetic number, because the mean of its divisors is an integer number (10616555161).

Almost surely, 2^21233110321 is an apocalyptic number.

It is an amenable number.

21233110321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233110321 is an equidigital number, since it uses as much as digits as its factorization.

21233110321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21233110321 its reverse (12301133212), we get a palindrome (33534243533).

The spelling of 21233110321 in words is "twenty-one billion, two hundred thirty-three million, one hundred ten thousand, three hundred twenty-one".