21443443311 has 8 divisors (see below), whose sum is σ = 28659496320. Its totient is φ = 14261509592.

The previous prime is 21443443297. The next prime is 21443443313. The reversal of 21443443311 is 11334434412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21443443311 - 2⁷ = 21443443183 is a prime.

It is a super-2 number, since 2×21443443311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443443313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8528355 + ... + 8530868.

It is an arithmetic number, because the mean of its divisors is an integer number (3582437040).

Almost surely, 2^21443443311 is an apocalyptic number.

21443443311 is a deficient number, since it is larger than the sum of its proper divisors (7216053009).

21443443311 is a wasteful number, since it uses less digits than its factorization.

21443443311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17059645.

The product of its digits is 13824, while the sum is 30.

Adding to 21443443311 its reverse (11334434412), we get a palindrome (32777877723).

The spelling of 21443443311 in words is "twenty-one billion, four hundred forty-three million, four hundred forty-three thousand, three hundred eleven".