21168116 has 24 divisors (see below), whose sum is σ = 37908360. Its totient is φ = 10340352.

The previous prime is 21168113. The next prime is 21168137. The reversal of 21168116 is 61186112.

It can be written as a sum of positive squares in 4 ways, for example, as 556516 + 20611600 = 746^2 + 4540^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21168113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34226 + ... + 34838.

It is an arithmetic number, because the mean of its divisors is an integer number (1579515).

Almost surely, 2^21168116 is an apocalyptic number.

It is an amenable number.

21168116 is a deficient number, since it is larger than the sum of its proper divisors (16740244).

21168116 is a wasteful number, since it uses less digits than its factorization.

21168116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803 (or 801 counting only the distinct ones).

The product of its digits is 576, while the sum is 26.

The square root of 21168116 is about 4600.8820893390. The cubic root of 21168116 is about 276.6266828236.

The spelling of 21168116 in words is "twenty-one million, one hundred sixty-eight thousand, one hundred sixteen".