21282230 has 16 divisors (see below), whose sum is σ = 39629520. Its totient is φ = 8219232.

The previous prime is 21282221. The next prime is 21282241. The reversal of 21282230 is 3228212.

It is a congruent number.

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, 36404 + ... + 36983.

It is an arithmetic number, because the mean of its divisors is an integer number (2476845).

Almost surely, 2^21282230 is an apocalyptic number.

21282230 is a deficient number, since it is larger than the sum of its proper divisors (18347290).

21282230 is a wasteful number, since it uses less digits than its factorization.

21282230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73423.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21282230 is about 4613.2667384403. The cubic root of 21282230 is about 277.1228759717.

It can be divided in two parts, 21282 and 230, that added together give a palindrome (21512).

The spelling of 21282230 in words is "twenty-one million, two hundred eighty-two thousand, two hundred thirty".