21443222444 has 24 divisors (see below), whose sum is σ = 43065899520. Its totient is φ = 9151497936.

The previous prime is 21443222419. The next prime is 21443222467. The reversal of 21443222444 is 44422234412.

It is a self number, because there is not a number n which added to its sum of digits gives 21443222444.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1595462 + ... + 1608845.

It is an arithmetic number, because the mean of its divisors is an integer number (1794412480).

Almost surely, 2^21443222444 is an apocalyptic number.

It is an amenable number.

21443222444 is an abundant number, since it is smaller than the sum of its proper divisors (21622677076).

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

21443222444 is a wasteful number, since it uses less digits than its factorization.

21443222444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3204557 (or 3204555 counting only the distinct ones).

The product of its digits is 49152, while the sum is 32.

Adding to 21443222444 its reverse (44422234412), we get a palindrome (65865456856).

The spelling of 21443222444 in words is "twenty-one billion, four hundred forty-three million, two hundred twenty-two thousand, four hundred forty-four".