172105212 has 48 divisors (see below), whose sum is σ = 429462432. Its totient is φ = 53452800.

The previous prime is 172105187. The next prime is 172105243. The reversal of 172105212 is 212501271.

172105212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16428 + ... + 24780.

It is an arithmetic number, because the mean of its divisors is an integer number (8947134).

Almost surely, 2^172105212 is an apocalyptic number.

172105212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172105212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214731216).

172105212 is an abundant number, since it is smaller than the sum of its proper divisors (257357220).

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

172105212 is a wasteful number, since it uses less digits than its factorization.

172105212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8478 (or 8476 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 172105212 is about 13118.8876052812. The cubic root of 172105212 is about 556.2431479693.

Adding to 172105212 its reverse (212501271), we get a palindrome (384606483).

It can be divided in two parts, 17210 and 5212, that added together give a palindrome (22422).

The spelling of 172105212 in words is "one hundred seventy-two million, one hundred five thousand, two hundred twelve".