21346563 has 16 divisors (see below), whose sum is σ = 32601600. Its totient is φ = 12170496.

The previous prime is 21346547. The next prime is 21346571. The reversal of 21346563 is 36564312.

It is not a de Polignac number, because 21346563 - 2⁴ = 21346547 is a prime.

It is a super-3 number, since 3×21346563³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21346563.

It is not an unprimeable number, because it can be changed into a prime (21346513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11731 + ... + 13427.

It is an arithmetic number, because the mean of its divisors is an integer number (2037600).

Almost surely, 2^21346563 is an apocalyptic number.

21346563 is a deficient number, since it is larger than the sum of its proper divisors (11255037).

21346563 is a wasteful number, since it uses less digits than its factorization.

21346563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306.

The product of its digits is 12960, while the sum is 30.

The square root of 21346563 is about 4620.2340849788. The cubic root of 21346563 is about 277.4018287591.

The spelling of 21346563 in words is "twenty-one million, three hundred forty-six thousand, five hundred sixty-three".