21444230 has 32 divisors (see below), whose sum is σ = 39892608. Its totient is φ = 8294400.

The previous prime is 21444223. The next prime is 21444233. The reversal of 21444230 is 3244412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78995 + ... + 79265.

It is an arithmetic number, because the mean of its divisors is an integer number (1246644).

Almost surely, 2^21444230 is an apocalyptic number.

21444230 is a deficient number, since it is larger than the sum of its proper divisors (18448378).

21444230 is a wasteful number, since it uses less digits than its factorization.

21444230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 21444230 is about 4630.7915090187. The cubic root of 21444230 is about 277.8242510096.

Adding to 21444230 its reverse (3244412), we get a palindrome (24688642).

It can be divided in two parts, 214 and 44230, that added together give a palindrome (44444).

The spelling of 21444230 in words is "twenty-one million, four hundred forty-four thousand, two hundred thirty".