131224034042221 has 16 divisors (see below), whose sum is σ = 140520228451200. Its totient is φ = 122103392260608.

The previous prime is 131224034042209. The next prime is 131224034042261. The reversal of 131224034042221 is 122240430422131.

It is a cyclic number.

It is not a de Polignac number, because 131224034042221 - 2¹⁷ = 131224033911149 is a prime.

It is a super-2 number, since 2×131224034042221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131224034042261) 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, 8392720 + ... + 18245158.

It is an arithmetic number, because the mean of its divisors is an integer number (8782514278200).

Almost surely, 2^{131224034042221} is an apocalyptic number.

It is an amenable number.

131224034042221 is a deficient number, since it is larger than the sum of its proper divisors (9296194408979).

131224034042221 is an equidigital number, since it uses as much as digits as its factorization.

131224034042221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9861348.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 131224034042221 its reverse (122240430422131), we get a palindrome (253464464464352).

The spelling of 131224034042221 in words is "one hundred thirty-one trillion, two hundred twenty-four billion, thirty-four million, forty-two thousand, two hundred twenty-one".