21183696 has 60 divisors (see below), whose sum is σ = 59726212. Its totient is φ = 7008768.

The previous prime is 21183671. The next prime is 21183703. The reversal of 21183696 is 69638112.

It can be written as a sum of positive squares in 2 ways, for example, as 3240000 + 17943696 = 1800^2 + 4236^2 .

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

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21183696.

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 11 ways as a sum of consecutive naturals, for example, 22140 + ... + 23076.

Almost surely, 2^21183696 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 21183696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29863106).

21183696 is an abundant number, since it is smaller than the sum of its proper divisors (38542516).

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

21183696 is a wasteful number, since it uses less digits than its factorization.

21183696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108 (or 1099 counting only the distinct ones).

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

The square root of 21183696 is about 4602.5749314922. The cubic root of 21183696 is about 276.6945330877.

The spelling of 21183696 in words is "twenty-one million, one hundred eighty-three thousand, six hundred ninety-six".