21384267 has 8 divisors (see below), whose sum is σ = 28621824. Its totient is φ = 14201448.

The previous prime is 21384263. The next prime is 21384289. The reversal of 21384267 is 76248312.

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

It is not a de Polignac number, because 21384267 - 2² = 21384263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21384263) 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, 12763 + ... + 14340.

It is an arithmetic number, because the mean of its divisors is an integer number (3577728).

Almost surely, 2^21384267 is an apocalyptic number.

21384267 is a deficient number, since it is larger than the sum of its proper divisors (7237557).

21384267 is a wasteful number, since it uses less digits than its factorization.

21384267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27369.

The product of its digits is 16128, while the sum is 33.

The square root of 21384267 is about 4624.3125975652. The cubic root of 21384267 is about 277.5650557644.

The spelling of 21384267 in words is "twenty-one million, three hundred eighty-four thousand, two hundred sixty-seven".