21342065263 has 4 divisors (see below), whose sum is σ = 22269981168. Its totient is φ = 20414149360.

The previous prime is 21342065237. The next prime is 21342065333. The reversal of 21342065263 is 36256024312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21342065263 - 2¹⁷ = 21341934191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342065233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463957918 + ... + 463957963.

It is an arithmetic number, because the mean of its divisors is an integer number (5567495292).

Almost surely, 2^21342065263 is an apocalyptic number.

21342065263 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21342065263 is a deficient number, since it is larger than the sum of its proper divisors (927915905).

21342065263 is an equidigital number, since it uses as much as digits as its factorization.

21342065263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927915904.

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 21342065263 its reverse (36256024312), we get a palindrome (57598089575).

The spelling of 21342065263 in words is "twenty-one billion, three hundred forty-two million, sixty-five thousand, two hundred sixty-three".