21320116 has 12 divisors (see below), whose sum is σ = 37350432. Its totient is φ = 10648568.

The previous prime is 21320107. The next prime is 21320183. The reversal of 21320116 is 61102312.

It is a self number, because there is not a number n which added to its sum of digits gives 21320116.

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 3 ways as a sum of consecutive naturals, for example, 2361 + ... + 6943.

It is an arithmetic number, because the mean of its divisors is an integer number (3112536).

Almost surely, 2^21320116 is an apocalyptic number.

It is an amenable number.

21320116 is a deficient number, since it is larger than the sum of its proper divisors (16030316).

21320116 is a wasteful number, since it uses less digits than its factorization.

21320116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5750 (or 5748 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 21320116 is about 4617.3711135234. The cubic root of 21320116 is about 277.2872204879.

Adding to 21320116 its reverse (61102312), we get a palindrome (82422428).

The spelling of 21320116 in words is "twenty-one million, three hundred twenty thousand, one hundred sixteen".