131222320400020 has 96 divisors (see below), whose sum is σ = 288071759646720. Its totient is φ = 50150154862080.

The previous prime is 131222320399999. The next prime is 131222320400077. The reversal of 131222320400020 is 20004023222131.

It is a junction number, because it is equal to n+sod(n) for n = 131222320399964 and 131222320400000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1134955734 + ... + 1135071346.

It is an arithmetic number, because the mean of its divisors is an integer number (3000747496320).

Almost surely, 2^{131222320400020} is an apocalyptic number.

131222320400020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131222320400020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144035879823360).

131222320400020 is an abundant number, since it is smaller than the sum of its proper divisors (156849439246700).

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

131222320400020 is a wasteful number, since it uses less digits than its factorization.

131222320400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138905 (or 138903 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 131222320400020 its reverse (20004023222131), we get a palindrome (151226343622151).

The spelling of 131222320400020 in words is "one hundred thirty-one trillion, two hundred twenty-two billion, three hundred twenty million, four hundred thousand, twenty".