131221220313 has 8 divisors (see below), whose sum is σ = 175132994176. Its totient is φ = 87395130000.

The previous prime is 131221220311. The next prime is 131221220369. The reversal of 131221220313 is 313022122131.

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

It is not a de Polignac number, because 131221220313 - 2¹ = 131221220311 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 131221220313.

It is not an unprimeable number, because it can be changed into a prime (131221220311) 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, 21417313 + ... + 21423438.

It is an arithmetic number, because the mean of its divisors is an integer number (21891624272).

Almost surely, 2^131221220313 is an apocalyptic number.

It is an amenable number.

131221220313 is a deficient number, since it is larger than the sum of its proper divisors (43911773863).

131221220313 is a wasteful number, since it uses less digits than its factorization.

131221220313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42841775.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 131221220313 its reverse (313022122131), we get a palindrome (444243342444).

The spelling of 131221220313 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred twenty thousand, three hundred thirteen".