21444354044 has 48 divisors (see below), whose sum is σ = 39274937856. Its totient is φ = 10234963200.

The previous prime is 21444354023. The next prime is 21444354049. The reversal of 21444354044 is 44045344412.

It is a junction number, because it is equal to n+sod(n) for n = 21444353995 and 21444354013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444354049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7120499 + ... + 7123509.

It is an arithmetic number, because the mean of its divisors is an integer number (818227872).

Almost surely, 2^21444354044 is an apocalyptic number.

It is an amenable number.

21444354044 is a deficient number, since it is larger than the sum of its proper divisors (17830583812).

21444354044 is a wasteful number, since it uses less digits than its factorization.

21444354044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986 (or 3984 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 35.

Adding to 21444354044 its reverse (44045344412), we get a palindrome (65489698456).

The spelling of 21444354044 in words is "twenty-one billion, four hundred forty-four million, three hundred fifty-four thousand, forty-four".