21240413044 has 48 divisors (see below), whose sum is σ = 40544280000. Its totient is φ = 9697992192.

The previous prime is 21240413039. The next prime is 21240413057. The reversal of 21240413044 is 44031404212.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1356492 + ... + 1372060.

It is an arithmetic number, because the mean of its divisors is an integer number (844672500).

Almost surely, 2^21240413044 is an apocalyptic number.

It is an amenable number.

21240413044 is a deficient number, since it is larger than the sum of its proper divisors (19303866956).

21240413044 is a wasteful number, since it uses less digits than its factorization.

21240413044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16240 (or 16238 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21240413044 its reverse (44031404212), we get a palindrome (65271817256).

The spelling of 21240413044 in words is "twenty-one billion, two hundred forty million, four hundred thirteen thousand, forty-four".