21443321011 has 8 divisors (see below), whose sum is σ = 24508066304. Its totient is φ = 18378929160.

The previous prime is 21443320973. The next prime is 21443321041. The reversal of 21443321011 is 11012334412.

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 21443321011 - 2¹³ = 21443312819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443321041) 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, 57766 + ... + 214996.

It is an arithmetic number, because the mean of its divisors is an integer number (3063508288).

Almost surely, 2^21443321011 is an apocalyptic number.

21443321011 is a deficient number, since it is larger than the sum of its proper divisors (3064745293).

21443321011 is a wasteful number, since it uses less digits than its factorization.

21443321011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176721.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21443321011 its reverse (11012334412), we get a palindrome (32455655423).

The spelling of 21443321011 in words is "twenty-one billion, four hundred forty-three million, three hundred twenty-one thousand, eleven".