21198698 has 8 divisors (see below), whose sum is σ = 32181408. Its totient is φ = 10471564.

The previous prime is 21198679. The next prime is 21198701. The reversal of 21198698 is 89689112.

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

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, 63686 + ... + 64017.

It is an arithmetic number, because the mean of its divisors is an integer number (4022676).

Almost surely, 2^21198698 is an apocalyptic number.

21198698 is a deficient number, since it is larger than the sum of its proper divisors (10982710).

21198698 is a wasteful number, since it uses less digits than its factorization.

21198698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127788.

The product of its digits is 62208, while the sum is 44.

The square root of 21198698 is about 4604.2043829526. The cubic root of 21198698 is about 276.7598347531.

The spelling of 21198698 in words is "twenty-one million, one hundred ninety-eight thousand, six hundred ninety-eight".