21233402321 has 2 divisors, whose sum is σ = 21233402322. Its totient is φ = 21233402320.

The previous prime is 21233402303. The next prime is 21233402327. The reversal of 21233402321 is 12320433212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20174225296 + 1059177025 = 142036^2 + 32545^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233402321 - 2⁶ = 21233402257 is a prime.

It is not a weakly prime, because it can be changed into another prime (21233402327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616701160 + 10616701161.

It is an arithmetic number, because the mean of its divisors is an integer number (10616701161).

Almost surely, 2^21233402321 is an apocalyptic number.

It is an amenable number.

21233402321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233402321 is an equidigital number, since it uses as much as digits as its factorization.

21233402321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21233402321 its reverse (12320433212), we get a palindrome (33553835533).

The spelling of 21233402321 in words is "twenty-one billion, two hundred thirty-three million, four hundred two thousand, three hundred twenty-one".