21446611109 has 16 divisors (see below), whose sum is σ = 27284323200. Its totient is φ = 16711642080.

The previous prime is 21446611099. The next prime is 21446611111. The reversal of 21446611109 is 90111664412.

It is a happy number.

It is not a de Polignac number, because 21446611109 - 2⁴ = 21446611093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21446611139) 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 15 ways as a sum of consecutive naturals, for example, 2838344 + ... + 2845889.

It is an arithmetic number, because the mean of its divisors is an integer number (1705270200).

Almost surely, 2^21446611109 is an apocalyptic number.

It is an amenable number.

21446611109 is a deficient number, since it is larger than the sum of its proper divisors (5837712091).

21446611109 is an equidigital number, since it uses as much as digits as its factorization.

21446611109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5684265 (or 5684251 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 21446611109 in words is "twenty-one billion, four hundred forty-six million, six hundred eleven thousand, one hundred nine".