172124121 has 16 divisors (see below), whose sum is σ = 255127040. Its totient is φ = 102504960.

The previous prime is 172124107. The next prime is 172124143. The reversal of 172124121 is 121421271.

172124121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172124121 - 2¹⁰ = 172123097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172124171) 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, 69976 + ... + 72393.

It is an arithmetic number, because the mean of its divisors is an integer number (15945440).

Almost surely, 2^172124121 is an apocalyptic number.

It is an amenable number.

172124121 is a deficient number, since it is larger than the sum of its proper divisors (83002919).

172124121 is a wasteful number, since it uses less digits than its factorization.

172124121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142416.

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

The square root of 172124121 is about 13119.6082639689. The cubic root of 172124121 is about 556.2635184864.

Adding to 172124121 its reverse (121421271), we get a palindrome (293545392).

The spelling of 172124121 in words is "one hundred seventy-two million, one hundred twenty-four thousand, one hundred twenty-one".