131221434102 has 96 divisors (see below), whose sum is σ = 306484668000. Its totient is φ = 37355028480.

The previous prime is 131221434067. The next prime is 131221434121. The reversal of 131221434102 is 201434122131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 694774 + ... + 863222.

It is an arithmetic number, because the mean of its divisors is an integer number (3192548625).

Almost surely, 2^131221434102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131221434102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153242334000).

131221434102 is an abundant number, since it is smaller than the sum of its proper divisors (175263233898).

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

131221434102 is a wasteful number, since it uses less digits than its factorization.

131221434102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168542 (or 168531 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 131221434102 its reverse (201434122131), we get a palindrome (332655556233).

The spelling of 131221434102 in words is "one hundred thirty-one billion, two hundred twenty-one million, four hundred thirty-four thousand, one hundred two".