21117368 has 16 divisors (see below), whose sum is σ = 39690000. Its totient is φ = 10533376.

The previous prime is 21117359. The next prime is 21117377. The reversal of 21117368 is 86371112.

It is an interprime number because it is at equal distance from previous prime (21117359) and next prime (21117377).

It is a self number, because there is not a number n which added to its sum of digits gives 21117368.

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, 653 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (2480625).

Almost surely, 2^21117368 is an apocalyptic number.

It is an amenable number.

21117368 is a deficient number, since it is larger than the sum of its proper divisors (18572632).

21117368 is a wasteful number, since it uses less digits than its factorization.

21117368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6334 (or 6330 counting only the distinct ones).

The product of its digits is 2016, while the sum is 29.

The square root of 21117368 is about 4595.3637505643. The cubic root of 21117368 is about 276.4054462525.

The spelling of 21117368 in words is "twenty-one million, one hundred seventeen thousand, three hundred sixty-eight".