21443111013 has 4 divisors (see below), whose sum is σ = 28590814688. Its totient is φ = 14295407340.

The previous prime is 21443110999. The next prime is 21443111047. The reversal of 21443111013 is 31011134412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21443111013 - 2²¹ = 21441013861 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 (21443111093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3573851833 + ... + 3573851838.

It is an arithmetic number, because the mean of its divisors is an integer number (7147703672).

Almost surely, 2^21443111013 is an apocalyptic number.

It is an amenable number.

21443111013 is a deficient number, since it is larger than the sum of its proper divisors (7147703675).

21443111013 is an equidigital number, since it uses as much as digits as its factorization.

21443111013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7147703674.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21443111013 its reverse (31011134412), we get a palindrome (52454245425).

The spelling of 21443111013 in words is "twenty-one billion, four hundred forty-three million, one hundred eleven thousand, thirteen".