131221041 has 16 divisors (see below), whose sum is σ = 202942464. Its totient is φ = 73863504.

The previous prime is 131221037. The next prime is 131221061. The reversal of 131221041 is 140122131.

It is not a de Polignac number, because 131221041 - 2² = 131221037 is a prime.

It is a super-2 number, since 2×131221041² = 34437923202247362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131221041.

It is not an unprimeable number, because it can be changed into a prime (131221021) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 45225 + ... + 48038.

It is an arithmetic number, because the mean of its divisors is an integer number (12683904).

Almost surely, 2^131221041 is an apocalyptic number.

It is an amenable number.

131221041 is a deficient number, since it is larger than the sum of its proper divisors (71721423).

131221041 is an equidigital number, since it uses as much as digits as its factorization.

131221041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93340.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 131221041 is about 11455.1752932899. The cubic root of 131221041 is about 508.1607993762.

Adding to 131221041 its reverse (140122131), we get a palindrome (271343172).

The spelling of 131221041 in words is "one hundred thirty-one million, two hundred twenty-one thousand, forty-one".