21368366 has 8 divisors (see below), whose sum is σ = 32412960. Its totient is φ = 10564048.

The previous prime is 21368363. The next prime is 21368387. The reversal of 21368366 is 66386312.

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 (21368363) by changing a digit.

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, 59846 + ... + 60201.

It is an arithmetic number, because the mean of its divisors is an integer number (4051620).

Almost surely, 2^21368366 is an apocalyptic number.

21368366 is a deficient number, since it is larger than the sum of its proper divisors (11044594).

21368366 is a wasteful number, since it uses less digits than its factorization.

21368366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120138.

The product of its digits is 31104, while the sum is 35.

The square root of 21368366 is about 4622.5929952787. The cubic root of 21368366 is about 277.4962410551.

The spelling of 21368366 in words is "twenty-one million, three hundred sixty-eight thousand, three hundred sixty-six".