21563214 has 16 divisors (see below), whose sum is σ = 45396480. Its totient is φ = 6809400.

The previous prime is 21563189. The next prime is 21563219. The reversal of 21563214 is 41236512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21563219) 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 7 ways as a sum of consecutive naturals, for example, 94462 + ... + 94689.

It is an arithmetic number, because the mean of its divisors is an integer number (2837280).

Almost surely, 2^21563214 is an apocalyptic number.

21563214 is an abundant number, since it is smaller than the sum of its proper divisors (23833266).

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

21563214 is a wasteful number, since it uses less digits than its factorization.

21563214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189175.

The product of its digits is 1440, while the sum is 24.

The square root of 21563214 is about 4643.6207855509. The cubic root of 21563214 is about 278.3371425091.

Adding to 21563214 its reverse (41236512), we get a palindrome (62799726).

The spelling of 21563214 in words is "twenty-one million, five hundred sixty-three thousand, two hundred fourteen".