131221240323432 has 128 divisors (see below), whose sum is σ = 375200361999360. Its totient is φ = 37463534760960.

The previous prime is 131221240323431. The next prime is 131221240323451. The reversal of 131221240323432 is 234323042122131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 131221240323393 and 131221240323402.

It is not an unprimeable number, because it can be changed into a prime (131221240323431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3485921203 + ... + 3485958845.

It is an arithmetic number, because the mean of its divisors is an integer number (2931252828120).

Almost surely, 2^{131221240323432} is an apocalyptic number.

131221240323432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

131221240323432 is an abundant number, since it is smaller than the sum of its proper divisors (243979121675928).

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

131221240323432 is a wasteful number, since it uses less digits than its factorization.

131221240323432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52743 (or 52739 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 33.

Adding to 131221240323432 its reverse (234323042122131), we get a palindrome (365544282445563).

The spelling of 131221240323432 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, two hundred forty million, three hundred twenty-three thousand, four hundred thirty-two".