131221440311 has 16 divisors (see below), whose sum is σ = 142307225088. Its totient is φ = 120277980000.

The previous prime is 131221440277. The next prime is 131221440323. The reversal of 131221440311 is 113044122131.

It is a cyclic number.

It is not a de Polignac number, because 131221440311 - 2²⁶ = 131154331447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221440611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5584790 + ... + 5608236.

It is an arithmetic number, because the mean of its divisors is an integer number (8894201568).

Almost surely, 2^131221440311 is an apocalyptic number.

131221440311 is a deficient number, since it is larger than the sum of its proper divisors (11085784777).

131221440311 is a wasteful number, since it uses less digits than its factorization.

131221440311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26462.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 131221440311 its reverse (113044122131), we get a palindrome (244265562442).

The spelling of 131221440311 in words is "one hundred thirty-one billion, two hundred twenty-one million, four hundred forty thousand, three hundred eleven".