21183668 has 12 divisors (see below), whose sum is σ = 40441632. Its totient is φ = 9628920.

The previous prime is 21183641. The next prime is 21183671. The reversal of 21183668 is 86638112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240680 + ... + 240767.

It is an arithmetic number, because the mean of its divisors is an integer number (3370136).

Almost surely, 2^21183668 is an apocalyptic number.

It is an amenable number.

21183668 is a deficient number, since it is larger than the sum of its proper divisors (19257964).

21183668 is a wasteful number, since it uses less digits than its factorization.

21183668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481462 (or 481460 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 21183668 is about 4602.5718897156. The cubic root of 21183668 is about 276.6944111787.

The spelling of 21183668 in words is "twenty-one million, one hundred eighty-three thousand, six hundred sixty-eight".