21383366 has 8 divisors (see below), whose sum is σ = 33109824. Its totient is φ = 10346760.

The previous prime is 21383363. The next prime is 21383381. The reversal of 21383366 is 66338312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21383363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172385 + ... + 172508.

It is an arithmetic number, because the mean of its divisors is an integer number (4138728).

Almost surely, 2^21383366 is an apocalyptic number.

21383366 is a deficient number, since it is larger than the sum of its proper divisors (11726458).

21383366 is a wasteful number, since it uses less digits than its factorization.

21383366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344926.

The product of its digits is 15552, while the sum is 32.

The square root of 21383366 is about 4624.2151766543. The cubic root of 21383366 is about 277.5611574213.

The spelling of 21383366 in words is "twenty-one million, three hundred eighty-three thousand, three hundred sixty-six".