131223013121 has 4 divisors (see below), whose sum is σ = 132884064000. Its totient is φ = 129561962244.

The previous prime is 131223013111. The next prime is 131223013147. The reversal of 131223013121 is 121310322131.

It is a happy number.

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: 121310322131 = 1279 ⋅94847789.

It is a cyclic number.

It is not a de Polignac number, because 131223013121 - 2⁶ = 131223013057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131223013093 and 131223013102.

It is not an unprimeable number, because it can be changed into a prime (131223013111) 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, 830525321 + ... + 830525478.

It is an arithmetic number, because the mean of its divisors is an integer number (33221016000).

Almost surely, 2^131223013121 is an apocalyptic number.

It is an amenable number.

131223013121 is a deficient number, since it is larger than the sum of its proper divisors (1661050879).

131223013121 is an equidigital number, since it uses as much as digits as its factorization.

131223013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661050878.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 131223013121 its reverse (121310322131), we get a palindrome (252533335252).

The spelling of 131223013121 in words is "one hundred thirty-one billion, two hundred twenty-three million, thirteen thousand, one hundred twenty-one".