331031221201013 has 4 divisors (see below), whose sum is σ = 331043503022988. Its totient is φ = 331018939379040.

The previous prime is 331031221201001. The next prime is 331031221201019. The reversal of 331031221201013 is 310102122130133.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 174890627042884 + 156140594158129 = 13224622^2 + 12495623^2 .

It is a cyclic number.

It is not a de Polignac number, because 331031221201013 - 2⁴ = 331031221200997 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 331031221201013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331031221201019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6140870558 + ... + 6140924463.

It is an arithmetic number, because the mean of its divisors is an integer number (82760875755747).

Almost surely, 2^{331031221201013} is an apocalyptic number.

It is an amenable number.

331031221201013 is a deficient number, since it is larger than the sum of its proper divisors (12281821975).

331031221201013 is a wasteful number, since it uses less digits than its factorization.

331031221201013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12281821974.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 331031221201013 its reverse (310102122130133), we get a palindrome (641133343331146).

The spelling of 331031221201013 in words is "three hundred thirty-one trillion, thirty-one billion, two hundred twenty-one million, two hundred one thousand, thirteen".