130217221 has 4 divisors (see below), whose sum is σ = 134707500. Its totient is φ = 125726944.

The previous prime is 130217167. The next prime is 130217231. The reversal of 130217221 is 122712031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122712031 = 13 ⋅9439387.

It can be written as a sum of positive squares in 2 ways, for example, as 56085121 + 74132100 = 7489^2 + 8610^2 .

It is a cyclic number.

It is not a de Polignac number, because 130217221 - 2¹³ = 130209029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130217231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2245096 + ... + 2245153.

It is an arithmetic number, because the mean of its divisors is an integer number (33676875).

Almost surely, 2^130217221 is an apocalyptic number.

It is an amenable number.

130217221 is a deficient number, since it is larger than the sum of its proper divisors (4490279).

130217221 is an equidigital number, since it uses as much as digits as its factorization.

130217221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4490278.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 130217221 is about 11411.2760460870. The cubic root of 130217221 is about 506.8616981067.

Adding to 130217221 its reverse (122712031), we get a palindrome (252929252).

The spelling of 130217221 in words is "one hundred thirty million, two hundred seventeen thousand, two hundred twenty-one".