131011031221 has 8 divisors (see below), whose sum is σ = 150905845760. Its totient is φ = 111410954928.

The previous prime is 131011031209. The next prime is 131011031237. The reversal of 131011031221 is 122130110131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131011031221 - 2²⁵ = 130977476789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131011031195 and 131011031204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131011031321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73683606 + ... + 73685383.

It is an arithmetic number, because the mean of its divisors is an integer number (18863230720).

Almost surely, 2^131011031221 is an apocalyptic number.

It is an amenable number.

131011031221 is a deficient number, since it is larger than the sum of its proper divisors (19894814539).

131011031221 is a wasteful number, since it uses less digits than its factorization.

131011031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147369123.

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

Adding to 131011031221 its reverse (122130110131), we get a palindrome (253141141352).

The spelling of 131011031221 in words is "one hundred thirty-one billion, eleven million, thirty-one thousand, two hundred twenty-one".