21344247444 has 24 divisors (see below), whose sum is σ = 53634263200. Its totient is φ = 6567460704.

The previous prime is 21344247403. The next prime is 21344247479. The reversal of 21344247444 is 44474244312.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 7 ways as a sum of consecutive naturals, for example, 68410894 + ... + 68411205.

Almost surely, 2^21344247444 is an apocalyptic number.

It is an amenable number.

21344247444 is an abundant number, since it is smaller than the sum of its proper divisors (32290015756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21344247444 is a wasteful number, since it uses less digits than its factorization.

21344247444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136822119 (or 136822117 counting only the distinct ones).

The product of its digits is 344064, while the sum is 39.

The spelling of 21344247444 in words is "twenty-one billion, three hundred forty-four million, two hundred forty-seven thousand, four hundred forty-four".