21198803 has 4 divisors (see below), whose sum is σ = 21210288. Its totient is φ = 21187320.

The previous prime is 21198799. The next prime is 21198809. The reversal of 21198803 is 30889112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21198803 - 2² = 21198799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21198803.

It is not an unprimeable number, because it can be changed into a prime (21198809) 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, 2276 + ... + 6897.

It is an arithmetic number, because the mean of its divisors is an integer number (5302572).

Almost surely, 2^21198803 is an apocalyptic number.

21198803 is a deficient number, since it is larger than the sum of its proper divisors (11485).

21198803 is an equidigital number, since it uses as much as digits as its factorization.

21198803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11484.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 21198803 is about 4604.2157855600. The cubic root of 21198803 is about 276.7602916952.

The spelling of 21198803 in words is "twenty-one million, one hundred ninety-eight thousand, eight hundred three".