131111220320020 has 24 divisors (see below), whose sum is σ = 275334075238824. Its totient is φ = 52444390496256.

The previous prime is 131111220319999. The next prime is 131111220320077. The reversal of 131111220320020 is 20023022111131.

It can be written as a sum of positive squares in 4 ways, for example, as 37230352382224 + 93880867937796 = 6101668^2 + 9689214^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131111220320020.

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, 5442652 + ... + 17083468.

It is an arithmetic number, because the mean of its divisors is an integer number (11472253134951).

Almost surely, 2^{131111220320020} is an apocalyptic number.

131111220320020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131111220320020 is an abundant number, since it is smaller than the sum of its proper divisors (144222854918804).

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

131111220320020 is a wasteful number, since it uses less digits than its factorization.

131111220320020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12203979 (or 12203977 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 131111220320020 its reverse (20023022111131), we get a palindrome (151134242431151).

The spelling of 131111220320020 in words is "one hundred thirty-one trillion, one hundred eleven billion, two hundred twenty million, three hundred twenty thousand, twenty".