21223814 has 8 divisors (see below), whose sum is σ = 32612328. Its totient is φ = 10353040.

The previous prime is 21223793. The next prime is 21223823. The reversal of 21223814 is 41832212.

It is a happy number.

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 21223814.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129332 + ... + 129495.

It is an arithmetic number, because the mean of its divisors is an integer number (4076541).

Almost surely, 2^21223814 is an apocalyptic number.

21223814 is a deficient number, since it is larger than the sum of its proper divisors (11388514).

21223814 is a wasteful number, since it uses less digits than its factorization.

21223814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258870.

The product of its digits is 768, while the sum is 23.

The square root of 21223814 is about 4606.9310826189. The cubic root of 21223814 is about 276.8690923534.

The spelling of 21223814 in words is "twenty-one million, two hundred twenty-three thousand, eight hundred fourteen".