21244206 has 16 divisors (see below), whose sum is σ = 43027200. Its totient is φ = 6991608.

The previous prime is 21244199. The next prime is 21244213. The reversal of 21244206 is 60244212.

It is an interprime number because it is at equal distance from previous prime (21244199) and next prime (21244213).

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, 21936 + ... + 22883.

It is an arithmetic number, because the mean of its divisors is an integer number (2689200).

Almost surely, 2^21244206 is an apocalyptic number.

21244206 is an abundant number, since it is smaller than the sum of its proper divisors (21782994).

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

21244206 is a wasteful number, since it uses less digits than its factorization.

21244206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44903.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 21244206 is about 4609.1437382664. The cubic root of 21244206 is about 276.9577366044.

Adding to 21244206 its reverse (60244212), we get a palindrome (81488418).

The spelling of 21244206 in words is "twenty-one million, two hundred forty-four thousand, two hundred six".