21210021021263 has 2 divisors, whose sum is σ = 21210021021264. Its totient is φ = 21210021021262.

The previous prime is 21210021021197. The next prime is 21210021021317. The reversal of 21210021021263 is 36212012001212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210021021263 - 2¹⁰ = 21210021020239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210021021463) 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, 10605010510631 + 10605010510632.

It is an arithmetic number, because the mean of its divisors is an integer number (10605010510632).

Almost surely, 2^{21210021021263} is an apocalyptic number.

21210021021263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210021021263 is an equidigital number, since it uses as much as digits as its factorization.

21210021021263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21210021021263 its reverse (36212012001212), we get a palindrome (57422033022475).

The spelling of 21210021021263 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, twenty-one thousand, two hundred sixty-three".