131221240101240 has 64 divisors (see below), whose sum is σ = 414382863484800. Its totient is φ = 33150629077632.

The previous prime is 131221240101179. The next prime is 131221240101407. The reversal of 131221240101240 is 42101042122131.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 131221240101240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28776585462 + ... + 28776590021.

It is an arithmetic number, because the mean of its divisors is an integer number (6474732241950).

Almost surely, 2^{131221240101240} is an apocalyptic number.

131221240101240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131221240101240 is an abundant number, since it is smaller than the sum of its proper divisors (283161623383560).

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

131221240101240 is a wasteful number, since it uses less digits than its factorization.

131221240101240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57553175516 (or 57553175512 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 131221240101240 its reverse (42101042122131), we get a palindrome (173322282223371).

The spelling of 131221240101240 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, two hundred forty million, one hundred one thousand, two hundred forty".