210221108168 has 8 divisors (see below), whose sum is σ = 394164577830. Its totient is φ = 105110554080.

The previous prime is 210221108161. The next prime is 210221108173. The reversal of 210221108168 is 861801122012.

It can be written as a sum of positive squares in only one way, i.e., 207573182404 + 2647925764 = 455602^2 + 51458^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (210221108161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13138819253 + ... + 13138819268.

Almost surely, 2^210221108168 is an apocalyptic number.

It is an amenable number.

210221108168 is a deficient number, since it is larger than the sum of its proper divisors (183943469662).

210221108168 is a wasteful number, since it uses less digits than its factorization.

210221108168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26277638527 (or 26277638523 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 32.

The spelling of 210221108168 in words is "two hundred ten billion, two hundred twenty-one million, one hundred eight thousand, one hundred sixty-eight".