209921827216 has 20 divisors (see below), whose sum is σ = 406901452672. Its totient is φ = 104915000736.

The previous prime is 209921827187. The next prime is 209921827217. The reversal of 209921827216 is 612728129902.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 209921827216.

It is not an unprimeable number, because it can be changed into a prime (209921827217) by changing a digit.

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, 2831820 + ... + 2905003.

Almost surely, 2^209921827216 is an apocalyptic number.

It is an amenable number.

209921827216 is a deficient number, since it is larger than the sum of its proper divisors (196979625456).

209921827216 is a wasteful number, since it uses less digits than its factorization.

209921827216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5739118 (or 5739112 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 209921827216 in words is "two hundred nine billion, nine hundred twenty-one million, eight hundred twenty-seven thousand, two hundred sixteen".