211730172 has 24 divisors (see below), whose sum is σ = 523098576. Its totient is φ = 66425088.

The previous prime is 211730171. The next prime is 211730201. The reversal of 211730172 is 271037112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211730171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518743 + ... + 519150.

It is an arithmetic number, because the mean of its divisors is an integer number (21795774).

Almost surely, 2^211730172 is an apocalyptic number.

It is an amenable number.

211730172 is an abundant number, since it is smaller than the sum of its proper divisors (311368404).

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

211730172 is a wasteful number, since it uses less digits than its factorization.

211730172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037917 (or 1037915 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 211730172 is about 14550.9508967627. The cubic root of 211730172 is about 596.0201147814.

Adding to 211730172 its reverse (271037112), we get a palindrome (482767284).

The spelling of 211730172 in words is "two hundred eleven million, seven hundred thirty thousand, one hundred seventy-two".