131440221 has 12 divisors (see below), whose sum is σ = 207118080. Its totient is φ = 79660680.

The previous prime is 131440213. The next prime is 131440249. The reversal of 131440221 is 122044131.

131440221 is a `hidden beast` number, since 1 + 3 + 1 + 440 + 221 = 666.

It is not a de Polignac number, because 131440221 - 2³ = 131440213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131440194 and 131440203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131440261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 663741 + ... + 663938.

It is an arithmetic number, because the mean of its divisors is an integer number (17259840).

Almost surely, 2^131440221 is an apocalyptic number.

131440221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131440221 is a deficient number, since it is larger than the sum of its proper divisors (75677859).

131440221 is a wasteful number, since it uses less digits than its factorization.

131440221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327696 (or 1327693 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 131440221 is about 11464.7381566262. The cubic root of 131440221 is about 508.4435709202.

Adding to 131440221 its reverse (122044131), we get a palindrome (253484352).

The spelling of 131440221 in words is "one hundred thirty-one million, four hundred forty thousand, two hundred twenty-one".