21040331344 has 40 divisors (see below), whose sum is σ = 41404349952. Its totient is φ = 10356245760.

The previous prime is 21040331303. The next prime is 21040331381. The reversal of 21040331344 is 44313304012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344977 + ... + 401359.

Almost surely, 2^21040331344 is an apocalyptic number.

It is an amenable number.

21040331344 is a deficient number, since it is larger than the sum of its proper divisors (20364018608).

21040331344 is a wasteful number, since it uses less digits than its factorization.

21040331344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56755 (or 56749 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21040331344 its reverse (44313304012), we get a palindrome (65353635356).

The spelling of 21040331344 in words is "twenty-one billion, forty million, three hundred thirty-one thousand, three hundred forty-four".