21443021111 has 8 divisors (see below), whose sum is σ = 22706115984. Its totient is φ = 20180119680.

The previous prime is 21443021101. The next prime is 21443021147. The reversal of 21443021111 is 11112034412.

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 21443021111 - 2¹⁴ = 21443004727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443021101) 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 7 ways as a sum of consecutive naturals, for example, 223616 + ... + 304778.

It is an arithmetic number, because the mean of its divisors is an integer number (2838264498).

Almost surely, 2^21443021111 is an apocalyptic number.

21443021111 is a deficient number, since it is larger than the sum of its proper divisors (1263094873).

21443021111 is a wasteful number, since it uses less digits than its factorization.

21443021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96721.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21443021111 its reverse (11112034412), we get a palindrome (32555055523).

The spelling of 21443021111 in words is "twenty-one billion, four hundred forty-three million, twenty-one thousand, one hundred eleven".