21198596 has 6 divisors (see below), whose sum is σ = 37097550. Its totient is φ = 10599296.

The previous prime is 21198559. The next prime is 21198631. The reversal of 21198596 is 69589112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17724100 + 3474496 = 4210^2 + 1864^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2649821 + ... + 2649828.

It is an arithmetic number, because the mean of its divisors is an integer number (6182925).

Almost surely, 2^21198596 is an apocalyptic number.

It is an amenable number.

21198596 is a deficient number, since it is larger than the sum of its proper divisors (15898954).

21198596 is a wasteful number, since it uses less digits than its factorization.

21198596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5299653 (or 5299651 counting only the distinct ones).

The product of its digits is 38880, while the sum is 41.

The square root of 21198596 is about 4604.1933061069. The cubic root of 21198596 is about 276.7593908650.

The spelling of 21198596 in words is "twenty-one million, one hundred ninety-eight thousand, five hundred ninety-six".