131221304013 has 8 divisors (see below), whose sum is σ = 175066701408. Its totient is φ = 87428387984.

The previous prime is 131221303891. The next prime is 131221304023. The reversal of 131221304013 is 310403122131.

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 131221304013 - 2¹² = 131221299917 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221304023) 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, 13114506 + ... + 13124507.

It is an arithmetic number, because the mean of its divisors is an integer number (21883337676).

Almost surely, 2^131221304013 is an apocalyptic number.

It is an amenable number.

131221304013 is a deficient number, since it is larger than the sum of its proper divisors (43845397395).

131221304013 is a wasteful number, since it uses less digits than its factorization.

131221304013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26240683.

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

Adding to 131221304013 its reverse (310403122131), we get a palindrome (441624426144).

The spelling of 131221304013 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred four thousand, thirteen".