21433244320 has 48 divisors (see below), whose sum is σ = 50751550080. Its totient is φ = 8553740544.

The previous prime is 21433244317. The next prime is 21433244359. The reversal of 21433244320 is 2344233412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82332 + ... + 222811.

It is an arithmetic number, because the mean of its divisors is an integer number (1057323960).

Almost surely, 2^21433244320 is an apocalyptic number.

21433244320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21433244320 is an abundant number, since it is smaller than the sum of its proper divisors (29318305760).

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

21433244320 is a wasteful number, since it uses less digits than its factorization.

21433244320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305597 (or 305589 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21433244320 its reverse (2344233412), we get a palindrome (23777477732).

The spelling of 21433244320 in words is "twenty-one billion, four hundred thirty-three million, two hundred forty-four thousand, three hundred twenty".