212216705172 has 36 divisors (see below), whose sum is σ = 545528823840. Its totient is φ = 69539936592.

The previous prime is 212216705171. The next prime is 212216705179. The reversal of 212216705172 is 271507612212.

212216705172 is a `hidden beast` number, since 2 + 122 + 16 + 7 + 0 + 517 + 2 = 666.

212216705172 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212216705171) 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 11 ways as a sum of consecutive naturals, for example, 49954728 + ... + 49958975.

It is an arithmetic number, because the mean of its divisors is an integer number (15153578440).

Almost surely, 2^212216705172 is an apocalyptic number.

It is an amenable number.

212216705172 is an abundant number, since it is smaller than the sum of its proper divisors (333312118668).

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

212216705172 is a wasteful number, since it uses less digits than its factorization.

212216705172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99913772 (or 99913767 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 212216705172 in words is "two hundred twelve billion, two hundred sixteen million, seven hundred five thousand, one hundred seventy-two".