21810734269 has 2 divisors, whose sum is σ = 21810734270. Its totient is φ = 21810734268.

The previous prime is 21810734251. The next prime is 21810734279. The reversal of 21810734269 is 96243701812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15121620900 + 6689113369 = 122970^2 + 81787^2 .

It is a cyclic number.

It is not a de Polignac number, because 21810734269 - 2⁵ = 21810734237 is a prime.

It is a super-2 number, since 2×21810734269² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21810734219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10905367134 + 10905367135.

It is an arithmetic number, because the mean of its divisors is an integer number (10905367135).

Almost surely, 2^21810734269 is an apocalyptic number.

It is an amenable number.

21810734269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21810734269 is an equidigital number, since it uses as much as digits as its factorization.

21810734269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 21810734269 in words is "twenty-one billion, eight hundred ten million, seven hundred thirty-four thousand, two hundred sixty-nine".