28221214 has 8 divisors (see below), whose sum is σ = 48379248. Its totient is φ = 12094800.

The previous prime is 28221211. The next prime is 28221217. The reversal of 28221214 is 41212282.

It is an interprime number because it is at equal distance from previous prime (28221211) and next prime (28221217).

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 (28221211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1007887 + ... + 1007914.

It is an arithmetic number, because the mean of its divisors is an integer number (6047406).

Almost surely, 2^28221214 is an apocalyptic number.

28221214 is a deficient number, since it is larger than the sum of its proper divisors (20158034).

28221214 is a wasteful number, since it uses less digits than its factorization.

28221214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015810.

The product of its digits is 512, while the sum is 22.

The square root of 28221214 is about 5312.3642570893. The cubic root of 28221214 is about 304.4564861161.

Adding to 28221214 its reverse (41212282), we get a palindrome (69433496).

The spelling of 28221214 in words is "twenty-eight million, two hundred twenty-one thousand, two hundred fourteen".