21020303332409 has 2 divisors, whose sum is σ = 21020303332410. Its totient is φ = 21020303332408.

The previous prime is 21020303332241. The next prime is 21020303332429. The reversal of 21020303332409 is 90423330302012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16497025092409 + 4523278240000 = 4061653^2 + 2126800^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020303332409 - 2¹² = 21020303328313 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020303332429) 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, 10510151666204 + 10510151666205.

It is an arithmetic number, because the mean of its divisors is an integer number (10510151666205).

Almost surely, 2^{21020303332409} is an apocalyptic number.

It is an amenable number.

21020303332409 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020303332409 is an equidigital number, since it uses as much as digits as its factorization.

21020303332409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 32.

The spelling of 21020303332409 in words is "twenty-one trillion, twenty billion, three hundred three million, three hundred thirty-two thousand, four hundred nine".