21826206 has 16 divisors (see below), whose sum is σ = 48502800. Its totient is φ = 7275384.

The previous prime is 21826187. The next prime is 21826213. The reversal of 21826206 is 60262812.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21826206.

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, 202041 + ... + 202148.

It is an arithmetic number, because the mean of its divisors is an integer number (3031425).

Almost surely, 2^21826206 is an apocalyptic number.

21826206 is an abundant number, since it is smaller than the sum of its proper divisors (26676594).

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

21826206 is a wasteful number, since it uses less digits than its factorization.

21826206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404200 (or 404194 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 21826206 is about 4671.8525233573. The cubic root of 21826206 is about 279.4641366849.

The spelling of 21826206 in words is "twenty-one million, eight hundred twenty-six thousand, two hundred six".