21206196 has 36 divisors (see below), whose sum is σ = 58478784. Its totient is φ = 6426000.

The previous prime is 21206189. The next prime is 21206219. The reversal of 21206196 is 69160212.

21206196 is a `hidden beast` number, since 21 + 20 + 619 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 26380 + ... + 27171.

Almost surely, 2^21206196 is an apocalyptic number.

It is an amenable number.

21206196 is an abundant number, since it is smaller than the sum of its proper divisors (37272588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21206196 is a wasteful number, since it uses less digits than its factorization.

21206196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53572 (or 53567 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21206196 is about 4605.0185667378. The cubic root of 21206196 is about 276.7924609806.

The spelling of 21206196 in words is "twenty-one million, two hundred six thousand, one hundred ninety-six".