131021013221 has 12 divisors (see below), whose sum is σ = 152730414720. Its totient is φ = 112069251000.

The previous prime is 131021013199. The next prime is 131021013271. The reversal of 131021013221 is 122310120131.

It is not a de Polignac number, because 131021013221 - 2¹⁸ = 131020751077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131021013221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131021013271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2767655 + ... + 2814596.

It is an arithmetic number, because the mean of its divisors is an integer number (12727534560).

Almost surely, 2^131021013221 is an apocalyptic number.

It is an amenable number.

131021013221 is a deficient number, since it is larger than the sum of its proper divisors (21709401499).

131021013221 is an equidigital number, since it uses as much as digits as its factorization.

131021013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5582744 (or 5582737 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 131021013221 its reverse (122310120131), we get a palindrome (253331133352).

The spelling of 131021013221 in words is "one hundred thirty-one billion, twenty-one million, thirteen thousand, two hundred twenty-one".