131031011221 has 16 divisors (see below), whose sum is σ = 144284152320. Its totient is φ = 118001862720.

The previous prime is 131031011213. The next prime is 131031011227. The reversal of 131031011221 is 122110130131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131031011221 - 2³ = 131031011213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131031011195 and 131031011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131031011227) 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, 8400796 + ... + 8416378.

It is an arithmetic number, because the mean of its divisors is an integer number (9017759520).

Almost surely, 2^131031011221 is an apocalyptic number.

131031011221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131031011221 is a deficient number, since it is larger than the sum of its proper divisors (13253141099).

131031011221 is a wasteful number, since it uses less digits than its factorization.

131031011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22716.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 131031011221 its reverse (122110130131), we get a palindrome (253141141352).

The spelling of 131031011221 in words is "one hundred thirty-one billion, thirty-one million, eleven thousand, two hundred twenty-one".