21245132265263 has 2 divisors, whose sum is σ = 21245132265264. Its totient is φ = 21245132265262.

The previous prime is 21245132265209. The next prime is 21245132265281. The reversal of 21245132265263 is 36256223154212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21245132265263 - 2¹⁶ = 21245132199727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21245132265293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622566132631 + 10622566132632.

It is an arithmetic number, because the mean of its divisors is an integer number (10622566132632).

Almost surely, 2^{21245132265263} is an apocalyptic number.

21245132265263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21245132265263 is an equidigital number, since it uses as much as digits as its factorization.

21245132265263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 44.

The spelling of 21245132265263 in words is "twenty-one trillion, two hundred forty-five billion, one hundred thirty-two million, two hundred sixty-five thousand, two hundred sixty-three".