21368211 has 8 divisors (see below), whose sum is σ = 28547520. Its totient is φ = 14217192.

The previous prime is 21368209. The next prime is 21368233. The reversal of 21368211 is 11286312.

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

It is not a de Polignac number, because 21368211 - 2¹ = 21368209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21368261) 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 7 ways as a sum of consecutive naturals, for example, 5241 + ... + 8378.

It is an arithmetic number, because the mean of its divisors is an integer number (3568440).

Almost surely, 2^21368211 is an apocalyptic number.

21368211 is a deficient number, since it is larger than the sum of its proper divisors (7179309).

21368211 is a wasteful number, since it uses less digits than its factorization.

21368211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14145.

The product of its digits is 576, while the sum is 24.

The square root of 21368211 is about 4622.5762297663. The cubic root of 21368211 is about 277.4955700940.

The spelling of 21368211 in words is "twenty-one million, three hundred sixty-eight thousand, two hundred eleven".