21443013344 has 24 divisors (see below), whose sum is σ = 44051409360. Its totient is φ = 10255353856.

The previous prime is 21443013323. The next prime is 21443013353. The reversal of 21443013344 is 44331034412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14566529 + ... + 14568000.

It is an arithmetic number, because the mean of its divisors is an integer number (1835475390).

Almost surely, 2^21443013344 is an apocalyptic number.

It is an amenable number.

21443013344 is an abundant number, since it is smaller than the sum of its proper divisors (22608396016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21443013344 is a wasteful number, since it uses less digits than its factorization.

21443013344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29134562 (or 29134554 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21443013344 its reverse (44331034412), we get a palindrome (65774047756).

The spelling of 21443013344 in words is "twenty-one billion, four hundred forty-three million, thirteen thousand, three hundred forty-four".