21282238 has 8 divisors (see below), whose sum is σ = 32013360. Its totient is φ = 10611120.

The previous prime is 21282221. The next prime is 21282241. The reversal of 21282238 is 83228212.

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

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, 14103 + ... + 15538.

It is an arithmetic number, because the mean of its divisors is an integer number (4001670).

Almost surely, 2^21282238 is an apocalyptic number.

21282238 is a deficient number, since it is larger than the sum of its proper divisors (10731122).

21282238 is a wasteful number, since it uses less digits than its factorization.

21282238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30002.

The product of its digits is 3072, while the sum is 28.

The square root of 21282238 is about 4613.2676055048. The cubic root of 21282238 is about 277.1229106952.

The spelling of 21282238 in words is "twenty-one million, two hundred eighty-two thousand, two hundred thirty-eight".