21344234445 has 12 divisors (see below), whose sum is σ = 36996673116. Its totient is φ = 11383591680.

The previous prime is 21344234441. The next prime is 21344234473. The reversal of 21344234445 is 54443244312.

It can be written as a sum of positive squares in 2 ways, for example, as 9660137796 + 11684096649 = 98286^2 + 108093^2 .

It is not a de Polignac number, because 21344234445 - 2² = 21344234441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344234441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237158116 + ... + 237158205.

It is an arithmetic number, because the mean of its divisors is an integer number (3083056093).

Almost surely, 2^21344234445 is an apocalyptic number.

It is an amenable number.

21344234445 is a deficient number, since it is larger than the sum of its proper divisors (15652438671).

21344234445 is a wasteful number, since it uses less digits than its factorization.

21344234445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474316332 (or 474316329 counting only the distinct ones).

The product of its digits is 184320, while the sum is 36.

Adding to 21344234445 its reverse (54443244312), we get a palindrome (75787478757).

The spelling of 21344234445 in words is "twenty-one billion, three hundred forty-four million, two hundred thirty-four thousand, four hundred forty-five".