131221331124020 has 12 divisors (see below), whose sum is σ = 275564795360484. Its totient is φ = 52488532449600.

The previous prime is 131221331123999. The next prime is 131221331124043. The reversal of 131221331124020 is 20421133122131.

It can be written as a sum of positive squares in 2 ways, for example, as 24266145940624 + 106955185183396 = 4926068^2 + 10341914^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3280533278081 + ... + 3280533278120.

It is an arithmetic number, because the mean of its divisors is an integer number (22963732946707).

Almost surely, 2^{131221331124020} is an apocalyptic number.

131221331124020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131221331124020 is an abundant number, since it is smaller than the sum of its proper divisors (144343464236464).

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

131221331124020 is a wasteful number, since it uses less digits than its factorization.

131221331124020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561066556210 (or 6561066556208 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 131221331124020 its reverse (20421133122131), we get a palindrome (151642464246151).

The spelling of 131221331124020 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, three hundred thirty-one million, one hundred twenty-four thousand, twenty".