21432534560 has 24 divisors (see below), whose sum is σ = 50634363276. Its totient is φ = 8573013760.

The previous prime is 21432534553. The next prime is 21432534569. The reversal of 21432534560 is 6543523412.

It can be written as a sum of positive squares in 2 ways, for example, as 21091171984 + 341362576 = 145228^2 + 18476^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21432534560.

It is not an unprimeable number, because it can be changed into a prime (21432534569) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 66976511 + ... + 66976830.

Almost surely, 2^21432534560 is an apocalyptic number.

21432534560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432534560 is an abundant number, since it is smaller than the sum of its proper divisors (29201828716).

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

21432534560 is a wasteful number, since it uses less digits than its factorization.

21432534560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133953356 (or 133953348 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 21432534560 in words is "twenty-one billion, four hundred thirty-two million, five hundred thirty-four thousand, five hundred sixty".