21228298 has 16 divisors (see below), whose sum is σ = 39191040. Its totient is φ = 8397936.

The previous prime is 21228289. The next prime is 21228307. The reversal of 21228298 is 89282212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21228289) and next prime (21228307).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58138 + ... + 58501.

It is an arithmetic number, because the mean of its divisors is an integer number (2449440).

Almost surely, 2^21228298 is an apocalyptic number.

21228298 is a deficient number, since it is larger than the sum of its proper divisors (17962742).

21228298 is a wasteful number, since it uses less digits than its factorization.

21228298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116661.

The product of its digits is 9216, while the sum is 34.

The square root of 21228298 is about 4607.4177149462. The cubic root of 21228298 is about 276.8885892197. Note that the first 3 decimals are identical.

The spelling of 21228298 in words is "twenty-one million, two hundred twenty-eight thousand, two hundred ninety-eight".