21443434099 has 4 divisors (see below), whose sum is σ = 21571838064. Its totient is φ = 21315030136.

The previous prime is 21443434063. The next prime is 21443434169. The reversal of 21443434099 is 99043434412.

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 21443434099 - 2⁷ = 21443433971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443434699) 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, 64201732 + ... + 64202065.

It is an arithmetic number, because the mean of its divisors is an integer number (5392959516).

Almost surely, 2^21443434099 is an apocalyptic number.

21443434099 is a deficient number, since it is larger than the sum of its proper divisors (128403965).

21443434099 is a wasteful number, since it uses less digits than its factorization.

21443434099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128403964.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 21443434099 in words is "twenty-one billion, four hundred forty-three million, four hundred thirty-four thousand, ninety-nine".