131221222000 has 160 divisors (see below), whose sum is σ = 347336144064. Its totient is φ = 47551616000.

The previous prime is 131221221997. The next prime is 131221222081. The reversal of 131221222000 is 222122131.

It is a happy number.

131221222000 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6435822 + ... + 6456178.

Almost surely, 2^131221222000 is an apocalyptic number.

131221222000 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 131221222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173668072032).

131221222000 is an abundant number, since it is smaller than the sum of its proper divisors (216114922064).

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

131221222000 is a wasteful number, since it uses less digits than its factorization.

131221222000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20684 (or 20668 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 131221222000 its reverse (222122131), we get a palindrome (131443344131).

The spelling of 131221222000 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred twenty-two thousand".