21208196 has 12 divisors (see below), whose sum is σ = 37218048. Its totient is φ = 10574472.

The previous prime is 21208183. The next prime is 21208259. The reversal of 21208196 is 69180212.

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, 5756 + ... + 8691.

It is an arithmetic number, because the mean of its divisors is an integer number (3101504).

Almost surely, 2^21208196 is an apocalyptic number.

It is an amenable number.

21208196 is a deficient number, since it is larger than the sum of its proper divisors (16009852).

21208196 is a wasteful number, since it uses less digits than its factorization.

21208196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14818 (or 14816 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 21208196 is about 4605.2357160085. The cubic root of 21208196 is about 276.8011623293.

The spelling of 21208196 in words is "twenty-one million, two hundred eight thousand, one hundred ninety-six".