21670206196 has 24 divisors (see below), whose sum is σ = 38216652320. Its totient is φ = 10751248800.

The previous prime is 21670206193. The next prime is 21670206203. The reversal of 21670206196 is 69160207612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21670206193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1108426 + ... + 1127806.

Almost surely, 2^21670206196 is an apocalyptic number.

It is an amenable number.

21670206196 is a deficient number, since it is larger than the sum of its proper divisors (16546446124).

21670206196 is a wasteful number, since it uses less digits than its factorization.

21670206196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21535 (or 21533 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 21670206196 in words is "twenty-one billion, six hundred seventy million, two hundred six thousand, one hundred ninety-six".