21197548 has 12 divisors (see below), whose sum is σ = 37128280. Its totient is φ = 10589472.

The previous prime is 21197489. The next prime is 21197551. The reversal of 21197548 is 84579112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6643 + ... + 9301.

Almost surely, 2^21197548 is an apocalyptic number.

It is an amenable number.

21197548 is a deficient number, since it is larger than the sum of its proper divisors (15930732).

21197548 is a wasteful number, since it uses less digits than its factorization.

21197548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4656 (or 4654 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 21197548 is about 4604.0794954040. The cubic root of 21197548 is about 276.7548300501.

The spelling of 21197548 in words is "twenty-one million, one hundred ninety-seven thousand, five hundred forty-eight".