21327560 has 16 divisors (see below), whose sum is σ = 47987100. Its totient is φ = 8531008.

The previous prime is 21327541. The next prime is 21327563. The reversal of 21327560 is 6572312.

It can be written as a sum of positive squares in 2 ways, for example, as 19483396 + 1844164 = 4414^2 + 1358^2 .

It is not an unprimeable number, because it can be changed into a prime (21327563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266555 + ... + 266634.

Almost surely, 2^21327560 is an apocalyptic number.

21327560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21327560 is an abundant number, since it is smaller than the sum of its proper divisors (26659540).

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

21327560 is a wasteful number, since it uses less digits than its factorization.

21327560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533200 (or 533196 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21327560 is about 4618.1771295610. The cubic root of 21327560 is about 277.3194886970.

Adding to 21327560 its reverse (6572312), we get a palindrome (27899872).

The spelling of 21327560 in words is "twenty-one million, three hundred twenty-seven thousand, five hundred sixty".