21432344404 has 12 divisors (see below), whose sum is σ = 37539831700. Its totient is φ = 10706678208.

The previous prime is 21432344393. The next prime is 21432344429. The reversal of 21432344404 is 40444323412.

It can be written as a sum of positive squares in 2 ways, for example, as 4205781904 + 17226562500 = 64852^2 + 131250^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2368419 + ... + 2377450.

Almost surely, 2^21432344404 is an apocalyptic number.

It is an amenable number.

21432344404 is a deficient number, since it is larger than the sum of its proper divisors (16107487296).

21432344404 is a wasteful number, since it uses less digits than its factorization.

21432344404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4747002 (or 4747000 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 21432344404 its reverse (40444323412), we get a palindrome (61876667816).

The spelling of 21432344404 in words is "twenty-one billion, four hundred thirty-two million, three hundred forty-four thousand, four hundred four".