131121231320320 has 144 divisors (see below), whose sum is σ = 320150236154112. Its totient is φ = 51441848156160.

The previous prime is 131121231320257. The next prime is 131121231320323. The reversal of 131121231320320 is 23023132121131.

It is a super-3 number, since 3×131121231320320³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131121231320323) 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, 13802029 + ... + 21277651.

It is an arithmetic number, because the mean of its divisors is an integer number (2223265528848).

Almost surely, 2^{131121231320320} is an apocalyptic number.

131121231320320 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 131121231320320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160075118077056).

131121231320320 is an abundant number, since it is smaller than the sum of its proper divisors (189029004833792).

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

131121231320320 is an equidigital number, since it uses as much as digits as its factorization.

131121231320320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7475908 (or 7475894 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 131121231320320 its reverse (23023132121131), we get a palindrome (154144363441451).

The spelling of 131121231320320 in words is "one hundred thirty-one trillion, one hundred twenty-one billion, two hundred thirty-one million, three hundred twenty thousand, three hundred twenty".