131232121 has 4 divisors (see below), whose sum is σ = 131270272. Its totient is φ = 131193972.

The previous prime is 131232113. The next prime is 131232133. The reversal of 131232121 is 121232131.

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: 121232131 = 829 ⋅146239.

It is a cyclic number.

It is not a de Polignac number, because 131232121 - 2³ = 131232113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131232095 and 131232104.

It is not an unprimeable number, because it can be changed into a prime (131232151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13341 + ... + 20986.

It is an arithmetic number, because the mean of its divisors is an integer number (32817568).

Almost surely, 2^131232121 is an apocalyptic number.

It is an amenable number.

131232121 is a deficient number, since it is larger than the sum of its proper divisors (38151).

131232121 is an equidigital number, since it uses as much as digits as its factorization.

131232121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38150.

The product of its digits is 72, while the sum is 16.

The square root of 131232121 is about 11455.6589072825. The cubic root of 131232121 is about 508.1751016129.

Adding to 131232121 its reverse (121232131), we get a palindrome (252464252).

It can be divided in two parts, 1312 and 32121, that added together give a palindrome (33433).

The spelling of 131232121 in words is "one hundred thirty-one million, two hundred thirty-two thousand, one hundred twenty-one".