21916804269 has 4 divisors (see below), whose sum is σ = 29222405696. Its totient is φ = 14611202844.

The previous prime is 21916804237. The next prime is 21916804271. The reversal of 21916804269 is 96240861912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21916804269 - 2⁵ = 21916804237 is a prime.

It is a super-2 number, since 2×21916804269² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21916804229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3652800709 + ... + 3652800714.

It is an arithmetic number, because the mean of its divisors is an integer number (7305601424).

Almost surely, 2^21916804269 is an apocalyptic number.

It is an amenable number.

21916804269 is a deficient number, since it is larger than the sum of its proper divisors (7305601427).

21916804269 is an equidigital number, since it uses as much as digits as its factorization.

21916804269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7305601426.

The product of its (nonzero) digits is 373248, while the sum is 48.

The spelling of 21916804269 in words is "twenty-one billion, nine hundred sixteen million, eight hundred four thousand, two hundred sixty-nine".