21038198 has 8 divisors (see below), whose sum is σ = 31619208. Its totient is φ = 10498464.

The previous prime is 21038183. The next prime is 21038203. The reversal of 21038198 is 89183012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9011 + ... + 11102.

It is an arithmetic number, because the mean of its divisors is an integer number (3952401).

Almost surely, 2^21038198 is an apocalyptic number.

21038198 is a deficient number, since it is larger than the sum of its proper divisors (10581010).

21038198 is a wasteful number, since it uses less digits than its factorization.

21038198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20638.

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

The square root of 21038198 is about 4586.7415449314. The cubic root of 21038198 is about 276.0595947067.

It can be divided in two parts, 2103 and 8198, that added together give a palindrome (10301).

The spelling of 21038198 in words is "twenty-one million, thirty-eight thousand, one hundred ninety-eight".