21110206 has 8 divisors (see below), whose sum is σ = 34101144. Its totient is φ = 9743160.

The previous prime is 21110189. The next prime is 21110227. The reversal of 21110206 is 60201112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405940 + ... + 405991.

It is an arithmetic number, because the mean of its divisors is an integer number (4262643).

Almost surely, 2^21110206 is an apocalyptic number.

21110206 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21110206 is a deficient number, since it is larger than the sum of its proper divisors (12990938).

21110206 is a wasteful number, since it uses less digits than its factorization.

21110206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811946.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21110206 is about 4594.5844208154. The cubic root of 21110206 is about 276.3741948888.

Adding to 21110206 its reverse (60201112), we get a palindrome (81311318).

It can be divided in two parts, 21110 and 206, that added together give a square (21316 = 146²).

The spelling of 21110206 in words is "twenty-one million, one hundred ten thousand, two hundred six".