131221440308 has 24 divisors (see below), whose sum is σ = 271492636800. Its totient is φ = 54298526688.

The previous prime is 131221440277. The next prime is 131221440323. The reversal of 131221440308 is 803044122131.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80800568 + ... + 80802191.

It is an arithmetic number, because the mean of its divisors is an integer number (11312193200).

Almost surely, 2^131221440308 is an apocalyptic number.

It is an amenable number.

131221440308 is an abundant number, since it is smaller than the sum of its proper divisors (140271196492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131221440308 is a wasteful number, since it uses less digits than its factorization.

131221440308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161602799 (or 161602797 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 131221440308 its reverse (803044122131), we get a palindrome (934265562439).

The spelling of 131221440308 in words is "one hundred thirty-one billion, two hundred twenty-one million, four hundred forty thousand, three hundred eight".