172102101 has 12 divisors (see below), whose sum is σ = 243762912. Its totient is φ = 107985088.

The previous prime is 172102097. The next prime is 172102129. The reversal of 172102101 is 101201271.

It is not a de Polignac number, because 172102101 - 2² = 172102097 is a prime.

It is a super-2 number, since 2×172102101² = 59238266337228402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172102141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98385 + ... + 100118.

It is an arithmetic number, because the mean of its divisors is an integer number (20313576).

Almost surely, 2^172102101 is an apocalyptic number.

It is an amenable number.

172102101 is a deficient number, since it is larger than the sum of its proper divisors (71660811).

172102101 is a wasteful number, since it uses less digits than its factorization.

172102101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198540 (or 198523 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 172102101 is about 13118.7690352411. The cubic root of 172102101 is about 556.2397963705.

Adding to 172102101 its reverse (101201271), we get a palindrome (273303372).

The spelling of 172102101 in words is "one hundred seventy-two million, one hundred two thousand, one hundred one".