21444433432 has 16 divisors (see below), whose sum is σ = 40323528000. Its totient is φ = 10691492640.

The previous prime is 21444433421. The next prime is 21444433441. The reversal of 21444433432 is 23433444412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3837544 + ... + 3843127.

It is an arithmetic number, because the mean of its divisors is an integer number (2520220500).

Almost surely, 2^21444433432 is an apocalyptic number.

It is an amenable number.

21444433432 is a deficient number, since it is larger than the sum of its proper divisors (18879094568).

21444433432 is a wasteful number, since it uses less digits than its factorization.

21444433432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7681026 (or 7681022 counting only the distinct ones).

The product of its digits is 110592, while the sum is 34.

Adding to 21444433432 its reverse (23433444412), we get a palindrome (44877877844).

The spelling of 21444433432 in words is "twenty-one billion, four hundred forty-four million, four hundred thirty-three thousand, four hundred thirty-two".