21883666 has 8 divisors (see below), whose sum is σ = 37514880. Its totient is φ = 9378708.

The previous prime is 21883663. The next prime is 21883679. The reversal of 21883666 is 66638812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21883663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781546 + ... + 781573.

It is an arithmetic number, because the mean of its divisors is an integer number (4689360).

Almost surely, 2^21883666 is an apocalyptic number.

21883666 is a deficient number, since it is larger than the sum of its proper divisors (15631214).

21883666 is a wasteful number, since it uses less digits than its factorization.

21883666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563128.

The product of its digits is 82944, while the sum is 40.

The square root of 21883666 is about 4677.9980761005. The cubic root of 21883666 is about 279.7091622954.

It can be divided in two parts, 2188 and 3666, that multiplied together give a palindrome (8021208).

The spelling of 21883666 in words is "twenty-one million, eight hundred eighty-three thousand, six hundred sixty-six".