131221132 has 24 divisors (see below), whose sum is σ = 262782464. Its totient is φ = 56164752.

The previous prime is 131221121. The next prime is 131221151. The reversal of 131221132 is 231122131.

131221132 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×131221132² = 34437970966722848, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22813 + ... + 27979.

Almost surely, 2^131221132 is an apocalyptic number.

It is an amenable number.

131221132 is an abundant number, since it is smaller than the sum of its proper divisors (131561332).

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

131221132 is a wasteful number, since it uses less digits than its factorization.

131221132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6085 (or 6083 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 131221132 is about 11455.1792652931. The cubic root of 131221132 is about 508.1609168437.

Adding to 131221132 its reverse (231122131), we get a palindrome (362343263).

Subtracting 131221132 from its reverse (231122131), we obtain a palindrome (99900999).

The spelling of 131221132 in words is "one hundred thirty-one million, two hundred twenty-one thousand, one hundred thirty-two".