21334230 has 48 divisors (see below), whose sum is σ = 56042064. Its totient is φ = 5630400.

The previous prime is 21334219. The next prime is 21334241. The reversal of 21334230 is 3243312.

It is an interprime number because it is at equal distance from previous prime (21334219) and next prime (21334241).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7917 + ... + 10263.

It is an arithmetic number, because the mean of its divisors is an integer number (1167543).

Almost surely, 2^21334230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21334230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28021032).

21334230 is an abundant number, since it is smaller than the sum of its proper divisors (34707834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21334230 is a wasteful number, since it uses less digits than its factorization.

21334230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461 (or 2458 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 21334230 is about 4618.8992195111. The cubic root of 21334230 is about 277.3483953980.

Adding to 21334230 its reverse (3243312), we get a palindrome (24577542).

It can be divided in two parts, 213 and 34230, that added together give a palindrome (34443).

The spelling of 21334230 in words is "twenty-one million, three hundred thirty-four thousand, two hundred thirty".