211200122172 has 96 divisors (see below), whose sum is σ = 550535086080. Its totient is φ = 62596984320.

The previous prime is 211200122171. The next prime is 211200122179. The reversal of 211200122172 is 271221002112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211200122171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 296293 + ... + 714275.

It is an arithmetic number, because the mean of its divisors is an integer number (5734740480).

Almost surely, 2^211200122172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211200122172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275267543040).

211200122172 is an abundant number, since it is smaller than the sum of its proper divisors (339334963908).

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

211200122172 is a wasteful number, since it uses less digits than its factorization.

211200122172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418123 (or 418121 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

Adding to 211200122172 its reverse (271221002112), we get a palindrome (482421124284).

The spelling of 211200122172 in words is "two hundred eleven billion, two hundred million, one hundred twenty-two thousand, one hundred seventy-two".