21011313213263 has 2 divisors, whose sum is σ = 21011313213264. Its totient is φ = 21011313213262.

The previous prime is 21011313213199. The next prime is 21011313213281. The reversal of 21011313213263 is 36231231311012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011313213263 - 2⁶ = 21011313213199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011313210263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505656606631 + 10505656606632.

It is an arithmetic number, because the mean of its divisors is an integer number (10505656606632).

Almost surely, 2^{21011313213263} is an apocalyptic number.

21011313213263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011313213263 is an equidigital number, since it uses as much as digits as its factorization.

21011313213263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

Adding to 21011313213263 its reverse (36231231311012), we get a palindrome (57242544524275).

The spelling of 21011313213263 in words is "twenty-one trillion, eleven billion, three hundred thirteen million, two hundred thirteen thousand, two hundred sixty-three".