21716036 has 12 divisors (see below), whose sum is σ = 38074512. Its totient is φ = 10837608.

The previous prime is 21716033. The next prime is 21716047. The reversal of 21716036 is 63061712.

It is a junction number, because it is equal to n+sod(n) for n = 21715996 and 21716014.

It is not an unprimeable number, because it can be changed into a prime (21716033) 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 3 ways as a sum of consecutive naturals, for example, 2570 + ... + 7073.

It is an arithmetic number, because the mean of its divisors is an integer number (3172876).

Almost surely, 2^21716036 is an apocalyptic number.

It is an amenable number.

21716036 is a deficient number, since it is larger than the sum of its proper divisors (16358476).

21716036 is a wasteful number, since it uses less digits than its factorization.

21716036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10210 (or 10208 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21716036 is about 4660.0467808811. The cubic root of 21716036 is about 278.9931354109.

Adding to 21716036 its reverse (63061712), we get a palindrome (84777748).

The spelling of 21716036 in words is "twenty-one million, seven hundred sixteen thousand, thirty-six".