21010331320163 has 2 divisors, whose sum is σ = 21010331320164. Its totient is φ = 21010331320162.

The previous prime is 21010331320081. The next prime is 21010331320177. The reversal of 21010331320163 is 36102313301012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21010331320163 - 2¹⁰ = 21010331319139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21010331320663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505165660081 + 10505165660082.

It is an arithmetic number, because the mean of its divisors is an integer number (10505165660082).

Almost surely, 2^{21010331320163} is an apocalyptic number.

21010331320163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010331320163 is an equidigital number, since it uses as much as digits as its factorization.

21010331320163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 21010331320163 its reverse (36102313301012), we get a palindrome (57112644621175).

The spelling of 21010331320163 in words is "twenty-one trillion, ten billion, three hundred thirty-one million, three hundred twenty thousand, one hundred sixty-three".