21443111413 has 4 divisors (see below), whose sum is σ = 21763157920. Its totient is φ = 21123064908.

The previous prime is 21443111407. The next prime is 21443111423. The reversal of 21443111413 is 31411134412.

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 a cyclic number.

It is not a de Polignac number, because 21443111413 - 2⁹ = 21443110901 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 (21443111423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160023153 + ... + 160023286.

It is an arithmetic number, because the mean of its divisors is an integer number (5440789480).

Almost surely, 2^21443111413 is an apocalyptic number.

It is an amenable number.

21443111413 is a deficient number, since it is larger than the sum of its proper divisors (320046507).

21443111413 is an equidigital number, since it uses as much as digits as its factorization.

21443111413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320046506.

The product of its digits is 1152, while the sum is 25.

Adding to 21443111413 its reverse (31411134412), we get a palindrome (52854245825).

The spelling of 21443111413 in words is "twenty-one billion, four hundred forty-three million, one hundred eleven thousand, four hundred thirteen".