21188014 has 8 divisors (see below), whose sum is σ = 33163920. Its totient is φ = 10133376.

The previous prime is 21188003. The next prime is 21188029. The reversal of 21188014 is 41088112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21188014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230259 + ... + 230350.

It is an arithmetic number, because the mean of its divisors is an integer number (4145490).

Almost surely, 2^21188014 is an apocalyptic number.

21188014 is a deficient number, since it is larger than the sum of its proper divisors (11975906).

21188014 is a wasteful number, since it uses less digits than its factorization.

21188014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460634.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 21188014 is about 4603.0439928378. The cubic root of 21188014 is about 276.7133319134.

The spelling of 21188014 in words is "twenty-one million, one hundred eighty-eight thousand, fourteen".