21404444444 has 6 divisors (see below), whose sum is σ = 37457777784. Its totient is φ = 10702222220.

The previous prime is 21404444443. The next prime is 21404444561. The reversal of 21404444444 is 44444440412.

It is a happy number.

21404444444 is a modest number, since divided by 444444 gives 21404 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404444441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675555552 + ... + 2675555559.

It is an arithmetic number, because the mean of its divisors is an integer number (6242962964).

Almost surely, 2^21404444444 is an apocalyptic number.

It is an amenable number.

21404444444 is a deficient number, since it is larger than the sum of its proper divisors (16053333340).

21404444444 is a wasteful number, since it uses less digits than its factorization.

21404444444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351111115 (or 5351111113 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 35.

Adding to 21404444444 its reverse (44444440412), we get a palindrome (65848884856).

The spelling of 21404444444 in words is "twenty-one billion, four hundred four million, four hundred forty-four thousand, four hundred forty-four".