172132121 has 4 divisors (see below), whose sum is σ = 196722432. Its totient is φ = 147541812.

The previous prime is 172132067. The next prime is 172132127. The reversal of 172132121 is 121231271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121231271 = 7 ⋅17318753.

It is a cyclic number.

It is not a de Polignac number, because 172132121 - 2¹⁸ = 171869977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172132093 and 172132102.

It is not an unprimeable number, because it can be changed into a prime (172132127) 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 3 ways as a sum of consecutive naturals, for example, 12295145 + ... + 12295158.

It is an arithmetic number, because the mean of its divisors is an integer number (49180608).

Almost surely, 2^172132121 is an apocalyptic number.

It is an amenable number.

172132121 is a deficient number, since it is larger than the sum of its proper divisors (24590311).

172132121 is an equidigital number, since it uses as much as digits as its factorization.

172132121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24590310.

The product of its digits is 168, while the sum is 20.

The square root of 172132121 is about 13119.9131475784. The cubic root of 172132121 is about 556.2721363745.

Adding to 172132121 its reverse (121231271), we get a palindrome (293363392).

The spelling of 172132121 in words is "one hundred seventy-two million, one hundred thirty-two thousand, one hundred twenty-one".