131221242321 has 16 divisors (see below), whose sum is σ = 190285798080. Its totient is φ = 79952011200.

The previous prime is 131221242311. The next prime is 131221242349. The reversal of 131221242321 is 123242122131.

It is not a de Polignac number, because 131221242321 - 2⁵ = 131221242289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131221242291 and 131221242300.

It is not an unprimeable number, because it can be changed into a prime (131221242311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16652731 + ... + 16660608.

It is an arithmetic number, because the mean of its divisors is an integer number (11892862380).

Almost surely, 2^131221242321 is an apocalyptic number.

It is an amenable number.

131221242321 is a deficient number, since it is larger than the sum of its proper divisors (59064555759).

131221242321 is a wasteful number, since it uses less digits than its factorization.

131221242321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33313456.

The product of its digits is 1152, while the sum is 24.

Adding to 131221242321 its reverse (123242122131), we get a palindrome (254463364452).

The spelling of 131221242321 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred forty-two thousand, three hundred twenty-one".