131313332012221 has 8 divisors (see below), whose sum is σ = 132715396092888. Its totient is φ = 129913266600000.

The previous prime is 131313332012197. The next prime is 131313332012237. The reversal of 131313332012221 is 122210233313131.

It can be written as a sum of positive squares in 4 ways, for example, as 522338652900 + 130790993359321 = 722730^2 + 11436389^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 131313332012221 - 2⁹ = 131313332011709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131313332012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131313332015221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499535010 + ... + 499797811.

It is an arithmetic number, because the mean of its divisors is an integer number (16589424511611).

Almost surely, 2^{131313332012221} is an apocalyptic number.

It is an amenable number.

131313332012221 is a deficient number, since it is larger than the sum of its proper divisors (1402064080667).

131313332012221 is a wasteful number, since it uses less digits than its factorization.

131313332012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999334223.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 131313332012221 its reverse (122210233313131), we get a palindrome (253523565325352).

The spelling of 131313332012221 in words is "one hundred thirty-one trillion, three hundred thirteen billion, three hundred thirty-two million, twelve thousand, two hundred twenty-one".