21863196 has 72 divisors (see below), whose sum is σ = 58216704. Its totient is φ = 7173360.

The previous prime is 21863183. The next prime is 21863201. The reversal of 21863196 is 69136812.

21863196 is a `hidden beast` number, since 2 + 18 + 631 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21863196.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 80541 + ... + 80811.

Almost surely, 2^21863196 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21863196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29108352).

21863196 is an abundant number, since it is smaller than the sum of its proper divisors (36353508).

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

21863196 is a wasteful number, since it uses less digits than its factorization.

21863196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 359 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21863196 is about 4675.8096625077. The cubic root of 21863196 is about 279.6219216911.

The spelling of 21863196 in words is "twenty-one million, eight hundred sixty-three thousand, one hundred ninety-six".