21388314 has 8 divisors (see below), whose sum is σ = 42776640. Its totient is φ = 7129436.

The previous prime is 21388313. The next prime is 21388327. The reversal of 21388314 is 41388312.

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

21388314 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21388313) 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, 1782354 + ... + 1782365.

It is an arithmetic number, because the mean of its divisors is an integer number (5347080).

Almost surely, 2^21388314 is an apocalyptic number.

21388314 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21388314 is a wasteful number, since it uses less digits than its factorization.

21388314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3564724.

The product of its digits is 4608, while the sum is 30.

The square root of 21388314 is about 4624.7501554138. The cubic root of 21388314 is about 277.5825645077.

The spelling of 21388314 in words is "twenty-one million, three hundred eighty-eight thousand, three hundred fourteen".