130566221 has 4 divisors (see below), whose sum is σ = 132139392. Its totient is φ = 128993052.

The previous prime is 130566217. The next prime is 130566251. The reversal of 130566221 is 122665031.

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.

It is a cyclic number.

It is not a de Polignac number, because 130566221 - 2² = 130566217 is a prime.

It is a super-4 number, since 4×130566221⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130566211) 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, 786461 + ... + 786626.

It is an arithmetic number, because the mean of its divisors is an integer number (33034848).

Almost surely, 2^130566221 is an apocalyptic number.

It is an amenable number.

130566221 is a deficient number, since it is larger than the sum of its proper divisors (1573171).

130566221 is an equidigital number, since it uses as much as digits as its factorization.

130566221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573170.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 130566221 is about 11426.5577056260. The cubic root of 130566221 is about 507.3141137757.

The spelling of 130566221 in words is "one hundred thirty million, five hundred sixty-six thousand, two hundred twenty-one".