21168117 has 12 divisors (see below), whose sum is σ = 30687904. Its totient is φ = 14060520.

The previous prime is 21168113. The next prime is 21168137. The reversal of 21168117 is 71186112.

It is not a de Polignac number, because 21168117 - 2² = 21168113 is a prime.

It is a Duffinian number.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1609 + ... + 6702.

Almost surely, 2^21168117 is an apocalyptic number.

It is an amenable number.

21168117 is a deficient number, since it is larger than the sum of its proper divisors (9519787).

21168117 is a wasteful number, since it uses less digits than its factorization.

21168117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8600 (or 8597 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 21168117 is about 4600.8821980138. The cubic root of 21168117 is about 276.6266871796.

The spelling of 21168117 in words is "twenty-one million, one hundred sixty-eight thousand, one hundred seventeen".