131010221 has 4 divisors (see below), whose sum is σ = 131077632. Its totient is φ = 130942812.

The previous prime is 131010179. The next prime is 131010227. The reversal of 131010221 is 122010131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122010131 = 109 ⋅1119359.

It is a cyclic number.

It is not a de Polignac number, because 131010221 - 2⁶ = 131010157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131010227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30701 + ... + 34706.

It is an arithmetic number, because the mean of its divisors is an integer number (32769408).

Almost surely, 2^131010221 is an apocalyptic number.

It is an amenable number.

131010221 is a deficient number, since it is larger than the sum of its proper divisors (67411).

131010221 is an equidigital number, since it uses as much as digits as its factorization.

131010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67410.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 131010221 is about 11445.9696400087. The cubic root of 131010221 is about 507.8885161047. Note that the first 3 decimals are identical.

Adding to 131010221 its reverse (122010131), we get a palindrome (253020352).

The spelling of 131010221 in words is "one hundred thirty-one million, ten thousand, two hundred twenty-one".