21063560 has 32 divisors (see below), whose sum is σ = 54164160. Its totient is φ = 7221696.

The previous prime is 21063529. The next prime is 21063569. The reversal of 21063560 is 6536012.

It is not an unprimeable number, because it can be changed into a prime (21063569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37334 + ... + 37893.

It is an arithmetic number, because the mean of its divisors is an integer number (1692630).

Almost surely, 2^21063560 is an apocalyptic number.

21063560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21063560 is an abundant number, since it is smaller than the sum of its proper divisors (33100600).

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

21063560 is a wasteful number, since it uses less digits than its factorization.

21063560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75245 (or 75241 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 21063560 is about 4589.5054199772. The cubic root of 21063560 is about 276.1704820851.

Adding to 21063560 its reverse (6536012), we get a palindrome (27599572).

The spelling of 21063560 in words is "twenty-one million, sixty-three thousand, five hundred sixty".