21818414 has 8 divisors (see below), whose sum is σ = 32917320. Its totient is φ = 10845976.

The previous prime is 21818399. The next prime is 21818417. The reversal of 21818414 is 41481812.

It is a happy number.

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 (21818417) by changing a digit.

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, 31184 + ... + 31875.

It is an arithmetic number, because the mean of its divisors is an integer number (4114665).

Almost surely, 2^21818414 is an apocalyptic number.

21818414 is a deficient number, since it is larger than the sum of its proper divisors (11098906).

21818414 is a wasteful number, since it uses less digits than its factorization.

21818414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63234.

The product of its digits is 2048, while the sum is 29.

The square root of 21818414 is about 4671.0185184818. The cubic root of 21818414 is about 279.4308763046.

The spelling of 21818414 in words is "twenty-one million, eight hundred eighteen thousand, four hundred fourteen".