21260563 has 8 divisors (see below), whose sum is σ = 22496000. Its totient is φ = 20036808.

The previous prime is 21260549. The next prime is 21260609. The reversal of 21260563 is 36506212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21260563 - 2⁵ = 21260531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21260663) 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, 970 + ... + 6592.

It is an arithmetic number, because the mean of its divisors is an integer number (2812000).

Almost surely, 2^21260563 is an apocalyptic number.

21260563 is a deficient number, since it is larger than the sum of its proper divisors (1235437).

21260563 is a wasteful number, since it uses less digits than its factorization.

21260563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5841.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 21260563 is about 4610.9178045157. The cubic root of 21260563 is about 277.0287996747.

Adding to 21260563 its reverse (36506212), we get a palindrome (57766775).

The spelling of 21260563 in words is "twenty-one million, two hundred sixty thousand, five hundred sixty-three".