131221032308 has 12 divisors (see below), whose sum is σ = 229799794980. Its totient is φ = 65563948032.

The previous prime is 131221032247. The next prime is 131221032311. The reversal of 131221032308 is 803230122131.

It can be written as a sum of positive squares in 2 ways, for example, as 37675586404 + 93545445904 = 194102^2 + 305852^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11635691 + ... + 11646962.

It is an arithmetic number, because the mean of its divisors is an integer number (19149982915).

Almost surely, 2^131221032308 is an apocalyptic number.

It is an amenable number.

131221032308 is a deficient number, since it is larger than the sum of its proper divisors (98578762672).

131221032308 is a wasteful number, since it uses less digits than its factorization.

131221032308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23284066 (or 23284064 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 131221032308 its reverse (803230122131), we get a palindrome (934451154439).

The spelling of 131221032308 in words is "one hundred thirty-one billion, two hundred twenty-one million, thirty-two thousand, three hundred eight".