21300806 has 16 divisors (see below), whose sum is σ = 33973344. Its totient is φ = 9993984.

The previous prime is 21300791. The next prime is 21300833. The reversal of 21300806 is 60800312.

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, 1931 + ... + 6806.

It is an arithmetic number, because the mean of its divisors is an integer number (2123334).

Almost surely, 2^21300806 is an apocalyptic number.

21300806 is a deficient number, since it is larger than the sum of its proper divisors (12672538).

21300806 is a wasteful number, since it uses less digits than its factorization.

21300806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8815.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21300806 is about 4615.2796231648. The cubic root of 21300806 is about 277.2034805813.

The spelling of 21300806 in words is "twenty-one million, three hundred thousand, eight hundred six".