21233302309 has 2 divisors, whose sum is σ = 21233302310. Its totient is φ = 21233302308.

The previous prime is 21233302297. The next prime is 21233302319. The reversal of 21233302309 is 90320333212.

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., 16979393025 + 4253909284 = 130305^2 + 65222^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233302309 - 2¹⁷ = 21233171237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233302319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616651154 + 10616651155.

It is an arithmetic number, because the mean of its divisors is an integer number (10616651155).

Almost surely, 2^21233302309 is an apocalyptic number.

It is an amenable number.

21233302309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233302309 is an equidigital number, since it uses as much as digits as its factorization.

21233302309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 28.

The spelling of 21233302309 in words is "twenty-one billion, two hundred thirty-three million, three hundred two thousand, three hundred nine".