131221121330 has 32 divisors (see below), whose sum is σ = 269329871664. Its totient is φ = 45600823296.

The previous prime is 131221121327. The next prime is 131221121357. The reversal of 131221121330 is 33121122131.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 15533384689 + 115687736641 = 124633^2 + 340129^2 .

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 15 ways as a sum of consecutive naturals, for example, 29685827 + ... + 29690246.

Almost surely, 2^131221121330 is an apocalyptic number.

131221121330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131221121330 is an abundant number, since it is smaller than the sum of its proper divisors (138108750334).

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

131221121330 is a wasteful number, since it uses less digits than its factorization.

131221121330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59376110.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 131221121330 its reverse (33121122131), we get a palindrome (164342243461).

The spelling of 131221121330 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, three hundred thirty".