131221440304 has 20 divisors (see below), whose sum is σ = 256182319800. Its totient is φ = 65109873920.

The previous prime is 131221440277. The next prime is 131221440323. The reversal of 131221440304 is 403044122131.

It is a super-2 number, since 2×131221440304² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31300729 + ... + 31304920.

It is an arithmetic number, because the mean of its divisors is an integer number (12809115990).

Almost surely, 2^131221440304 is an apocalyptic number.

It is an amenable number.

131221440304 is a deficient number, since it is larger than the sum of its proper divisors (124960879496).

131221440304 is a wasteful number, since it uses less digits than its factorization.

131221440304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62605788 (or 62605782 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 131221440304 its reverse (403044122131), we get a palindrome (534265562435).

The spelling of 131221440304 in words is "one hundred thirty-one billion, two hundred twenty-one million, four hundred forty thousand, three hundred four".