21144303344 has 10 divisors (see below), whose sum is σ = 40967087760. Its totient is φ = 10572151664.

The previous prime is 21144303337. The next prime is 21144303353. The reversal of 21144303344 is 44330344112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660759464 + ... + 660759495.

It is an arithmetic number, because the mean of its divisors is an integer number (4096708776).

Almost surely, 2^21144303344 is an apocalyptic number.

It is an amenable number.

21144303344 is a deficient number, since it is larger than the sum of its proper divisors (19822784416).

21144303344 is a wasteful number, since it uses less digits than its factorization.

21144303344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321518967 (or 1321518961 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21144303344 its reverse (44330344112), we get a palindrome (65474647456).

The spelling of 21144303344 in words is "twenty-one billion, one hundred forty-four million, three hundred three thousand, three hundred forty-four".