21563196 has 24 divisors (see below), whose sum is σ = 50483664. Its totient is φ = 7163520.

The previous prime is 21563189. The next prime is 21563219. The reversal of 21563196 is 69136512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 886 + ... + 6626.

It is an arithmetic number, because the mean of its divisors is an integer number (2103486).

Almost surely, 2^21563196 is an apocalyptic number.

It is an amenable number.

21563196 is an abundant number, since it is smaller than the sum of its proper divisors (28920468).

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

21563196 is a wasteful number, since it uses less digits than its factorization.

21563196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6061 (or 6059 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 21563196 is about 4643.6188474077. The cubic root of 21563196 is about 278.3370650613.

The spelling of 21563196 in words is "twenty-one million, five hundred sixty-three thousand, one hundred ninety-six".