21443000042444 has 12 divisors (see below), whose sum is σ = 37525309222800. Its totient is φ = 10721483121648.

The previous prime is 21443000042437. The next prime is 21443000042473. The reversal of 21443000042444 is 44424000034412.

It is a self number, because there is not a number n which added to its sum of digits gives 21443000042444.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1115759 + ... + 6643110.

It is an arithmetic number, because the mean of its divisors is an integer number (3127109101900).

Almost surely, 2^{21443000042444} is an apocalyptic number.

It is an amenable number.

21443000042444 is a deficient number, since it is larger than the sum of its proper divisors (16082309180356).

21443000042444 is a wasteful number, since it uses less digits than its factorization.

21443000042444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8449792 (or 8449790 counting only the distinct ones).

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

Adding to 21443000042444 its reverse (44424000034412), we get a palindrome (65867000076856).

The spelling of 21443000042444 in words is "twenty-one trillion, four hundred forty-three billion, forty-two thousand, four hundred forty-four".