21144002404444 has 12 divisors (see below), whose sum is σ = 37049020737064. Its totient is φ = 10558567908144.

The previous prime is 21144002404403. The next prime is 21144002404453. The reversal of 21144002404444 is 44440420044112.

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, 3358319979 + ... + 3358326274.

Almost surely, 2^{21144002404444} is an apocalyptic number.

It is an amenable number.

21144002404444 is a deficient number, since it is larger than the sum of its proper divisors (15905018332620).

21144002404444 is a wasteful number, since it uses less digits than its factorization.

21144002404444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6716647044 (or 6716647042 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 34.

Adding to 21144002404444 its reverse (44440420044112), we get a palindrome (65584422448556).

The spelling of 21144002404444 in words is "twenty-one trillion, one hundred forty-four billion, two million, four hundred four thousand, four hundred forty-four".