21020021216333 has 2 divisors, whose sum is σ = 21020021216334. Its totient is φ = 21020021216332.

The previous prime is 21020021216297. The next prime is 21020021216347. The reversal of 21020021216333 is 33361212002012.

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., 19080847994569 + 1939173221764 = 4368163^2 + 1392542^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020021216333 - 2¹⁶ = 21020021150797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020021216353) 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, 10510010608166 + 10510010608167.

It is an arithmetic number, because the mean of its divisors is an integer number (10510010608167).

Almost surely, 2^{21020021216333} is an apocalyptic number.

It is an amenable number.

21020021216333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020021216333 is an equidigital number, since it uses as much as digits as its factorization.

21020021216333 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21020021216333 its reverse (33361212002012), we get a palindrome (54381233218345).

The spelling of 21020021216333 in words is "twenty-one trillion, twenty billion, twenty-one million, two hundred sixteen thousand, three hundred thirty-three".