131221403313 has 32 divisors (see below), whose sum is σ = 234913846272. Its totient is φ = 62923348800.

The previous prime is 131221403239. The next prime is 131221403371. The reversal of 131221403313 is 313304122131.

It is not a de Polignac number, because 131221403313 - 2⁸ = 131221403057 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131221403393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21845383 + ... + 21851388.

It is an arithmetic number, because the mean of its divisors is an integer number (7341057696).

Almost surely, 2^131221403313 is an apocalyptic number.

131221403313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

131221403313 is a deficient number, since it is larger than the sum of its proper divisors (103692442959).

131221403313 is a wasteful number, since it uses less digits than its factorization.

131221403313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43696805.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 131221403313 its reverse (313304122131), we get a palindrome (444525525444).

The spelling of 131221403313 in words is "one hundred thirty-one billion, two hundred twenty-one million, four hundred three thousand, three hundred thirteen".