21480563 has 4 divisors (see below), whose sum is σ = 23132928. Its totient is φ = 19828200.

The previous prime is 21480559. The next prime is 21480577. The reversal of 21480563 is 36508412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21480563 - 2² = 21480559 is a prime.

It is a super-2 number, since 2×21480563² = 922829173593938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21480593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826163 + ... + 826188.

It is an arithmetic number, because the mean of its divisors is an integer number (5783232).

Almost surely, 2^21480563 is an apocalyptic number.

21480563 is a deficient number, since it is larger than the sum of its proper divisors (1652365).

21480563 is a wasteful number, since it uses less digits than its factorization.

21480563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652364.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21480563 is about 4634.7128282128. The cubic root of 21480563 is about 277.9810685312.

Adding to 21480563 its reverse (36508412), we get a palindrome (57988975).

The spelling of 21480563 in words is "twenty-one million, four hundred eighty thousand, five hundred sixty-three".