172012211 has 16 divisors (see below), whose sum is σ = 203716608. Its totient is φ = 142128000.

The previous prime is 172012207. The next prime is 172012213. The reversal of 172012211 is 112210271.

It is not a de Polignac number, because 172012211 - 2² = 172012207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172012211.

It is not an unprimeable number, because it can be changed into a prime (172012213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60011 + ... + 62811.

It is an arithmetic number, because the mean of its divisors is an integer number (12732288).

Almost surely, 2^172012211 is an apocalyptic number.

172012211 is a deficient number, since it is larger than the sum of its proper divisors (31704397).

172012211 is a wasteful number, since it uses less digits than its factorization.

172012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 172012211 is about 13115.3425803522. The cubic root of 172012211 is about 556.1429370010.

Adding to 172012211 its reverse (112210271), we get a palindrome (284222482).

It can be divided in two parts, 1720 and 12211, that added together give a palindrome (13931).

The spelling of 172012211 in words is "one hundred seventy-two million, twelve thousand, two hundred eleven".