21344434424 has 32 divisors (see below), whose sum is σ = 41817323520. Its totient is φ = 10194403296.

The previous prime is 21344434417. The next prime is 21344434469. The reversal of 21344434424 is 42443444312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58649 + ... + 214775.

It is an arithmetic number, because the mean of its divisors is an integer number (1306791360).

Almost surely, 2^21344434424 is an apocalyptic number.

It is an amenable number.

21344434424 is a deficient number, since it is larger than the sum of its proper divisors (20472889096).

21344434424 is a wasteful number, since it uses less digits than its factorization.

21344434424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156899 (or 156895 counting only the distinct ones).

The product of its digits is 147456, while the sum is 35.

Adding to 21344434424 its reverse (42443444312), we get a palindrome (63787878736).

The spelling of 21344434424 in words is "twenty-one billion, three hundred forty-four million, four hundred thirty-four thousand, four hundred twenty-four".