131221121323 has 8 divisors (see below), whose sum is σ = 132920737776. Its totient is φ = 129529356000.

The previous prime is 131221121309. The next prime is 131221121327. The reversal of 131221121323 is 323121122131.

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 131221121323 - 2¹³ = 131221113131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131221121294 and 131221121303.

It is not an unprimeable number, because it can be changed into a prime (131221121327) 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, 1929136 + ... + 1995997.

It is an arithmetic number, because the mean of its divisors is an integer number (16615092222).

Almost surely, 2^131221121323 is an apocalyptic number.

131221121323 is a deficient number, since it is larger than the sum of its proper divisors (1699616453).

131221121323 is a wasteful number, since it uses less digits than its factorization.

131221121323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3925565.

The product of its digits is 432, while the sum is 22.

Adding to 131221121323 its reverse (323121122131), we get a palindrome (454342243454).

The spelling of 131221121323 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, three hundred twenty-three".