131221130123 has 8 divisors (see below), whose sum is σ = 131357846448. Its totient is φ = 131084482144.

The previous prime is 131221130099. The next prime is 131221130137. The reversal of 131221130123 is 321031122131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131221130123 - 2¹⁶ = 131221064587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131221130095 and 131221130104.

It is not an unprimeable number, because it can be changed into a prime (131221130023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4399940 + ... + 4429662.

It is an arithmetic number, because the mean of its divisors is an integer number (16419730806).

Almost surely, 2^131221130123 is an apocalyptic number.

131221130123 is a deficient number, since it is larger than the sum of its proper divisors (136716325).

131221130123 is a wasteful number, since it uses less digits than its factorization.

131221130123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34173.

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

Adding to 131221130123 its reverse (321031122131), we get a palindrome (452252252254).

The spelling of 131221130123 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred thirty thousand, one hundred twenty-three".