21103306 has 8 divisors (see below), whose sum is σ = 36177120. Its totient is φ = 9044268.

The previous prime is 21103301. The next prime is 21103309. The reversal of 21103306 is 60330112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21103306.

It is not an unprimeable number, because it can be changed into a prime (21103301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753676 + ... + 753703.

It is an arithmetic number, because the mean of its divisors is an integer number (4522140).

Almost surely, 2^21103306 is an apocalyptic number.

21103306 is a deficient number, since it is larger than the sum of its proper divisors (15073814).

21103306 is a wasteful number, since it uses less digits than its factorization.

21103306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507388.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 21103306 is about 4593.8334754320. The cubic root of 21103306 is about 276.3440800752.

Adding to 21103306 its reverse (60330112), we get a palindrome (81433418).

The spelling of 21103306 in words is "twenty-one million, one hundred three thousand, three hundred six".