21432314440 has 32 divisors (see below), whose sum is σ = 48245402880. Its totient is φ = 8568891072.

The previous prime is 21432314413. The next prime is 21432314441. The reversal of 21432314440 is 4441323412.

It is a junction number, because it is equal to n+sod(n) for n = 21432314399 and 21432314408.

It is not an unprimeable number, because it can be changed into a prime (21432314441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39294 + ... + 210733.

It is an arithmetic number, because the mean of its divisors is an integer number (1507668840).

Almost surely, 2^21432314440 is an apocalyptic number.

21432314440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432314440 is an abundant number, since it is smaller than the sum of its proper divisors (26813088440).

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

21432314440 is a wasteful number, since it uses less digits than its factorization.

21432314440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252181 (or 252177 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21432314440 its reverse (4441323412), we get a palindrome (25873637852).

The spelling of 21432314440 in words is "twenty-one billion, four hundred thirty-two million, three hundred fourteen thousand, four hundred forty".