21318696 has 48 divisors (see below), whose sum is σ = 65988000. Its totient is φ = 6090912.

The previous prime is 21318691. The next prime is 21318709. The reversal of 21318696 is 69681312.

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 21318696.

It is not an unprimeable number, because it can be changed into a prime (21318691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20646 + ... + 21653.

It is an arithmetic number, because the mean of its divisors is an integer number (1374750).

Almost surely, 2^21318696 is an apocalyptic number.

It is an amenable number.

21318696 is an abundant number, since it is smaller than the sum of its proper divisors (44669304).

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

21318696 is a wasteful number, since it uses less digits than its factorization.

21318696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42318 (or 42311 counting only the distinct ones).

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

The square root of 21318696 is about 4617.2173438122. The cubic root of 21318696 is about 277.2810642269.

The spelling of 21318696 in words is "twenty-one million, three hundred eighteen thousand, six hundred ninety-six".