21012303344 has 20 divisors (see below), whose sum is σ = 41168771280. Its totient is φ = 10388104320.

The previous prime is 21012303271. The next prime is 21012303353. The reversal of 21012303344 is 44330321012.

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, 7376492 + ... + 7379339.

It is an arithmetic number, because the mean of its divisors is an integer number (2058438564).

Almost surely, 2^21012303344 is an apocalyptic number.

It is an amenable number.

21012303344 is a deficient number, since it is larger than the sum of its proper divisors (20156467936).

21012303344 is a wasteful number, since it uses less digits than its factorization.

21012303344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14755928 (or 14755922 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21012303344 its reverse (44330321012), we get a palindrome (65342624356).

The spelling of 21012303344 in words is "twenty-one billion, twelve million, three hundred three thousand, three hundred forty-four".