131233123405221 has 24 divisors (see below), whose sum is σ = 179193042508320. Its totient is φ = 85429480693536.

The previous prime is 131233123405201. The next prime is 131233123405277. The reversal of 131233123405221 is 122504321332131.

It is a happy number.

It is not a de Polignac number, because 131233123405221 - 2¹³ = 131233123397029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131233123405201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15832570 + ... + 22652516.

It is an arithmetic number, because the mean of its divisors is an integer number (7466376771180).

Almost surely, 2^{131233123405221} is an apocalyptic number.

It is an amenable number.

131233123405221 is a deficient number, since it is larger than the sum of its proper divisors (47959919103099).

131233123405221 is an equidigital number, since it uses as much as digits as its factorization.

131233123405221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6823505 (or 6823462 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 131233123405221 its reverse (122504321332131), we get a palindrome (253737444737352).

The spelling of 131233123405221 in words is "one hundred thirty-one trillion, two hundred thirty-three billion, one hundred twenty-three million, four hundred five thousand, two hundred twenty-one".