21813696 has 42 divisors (see below), whose sum is σ = 62526672. Its totient is φ = 7271040.

The previous prime is 21813689. The next prime is 21813697. The reversal of 21813696 is 69631812.

It is a super-3 number, since 3×21813696³ (a number of 23 digits) contains 333 as substring.

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 21813696.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21813697) 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 5 ways as a sum of consecutive naturals, for example, 18360 + ... + 19511.

Almost surely, 2^21813696 is an apocalyptic number.

It is an amenable number.

21813696 is an abundant number, since it is smaller than the sum of its proper divisors (40712976).

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

21813696 is a wasteful number, since it uses less digits than its factorization.

21813696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37889 (or 37876 counting only the distinct ones).

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

The square root of 21813696 is about 4670.5134621367. The cubic root of 21813696 is about 279.4107335342.

The spelling of 21813696 in words is "twenty-one million, eight hundred thirteen thousand, six hundred ninety-six".