130221666 has 36 divisors (see below), whose sum is σ = 299732082. Its totient is φ = 40852224.

The previous prime is 130221661. The next prime is 130221667. The reversal of 130221666 is 666122031.

It can be written as a sum of positive squares in 3 ways, for example, as 116316225 + 13905441 = 10785^2 + 3729^2 .

It is not an unprimeable number, because it can be changed into a prime (130221661) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7315 + ... + 17718.

Almost surely, 2^130221666 is an apocalyptic number.

130221666 is an abundant number, since it is smaller than the sum of its proper divisors (169510416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

130221666 is a wasteful number, since it uses less digits than its factorization.

130221666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25075 (or 25055 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 130221666 is about 11411.4708079195. The cubic root of 130221666 is about 506.8674653280.

Adding to 130221666 its reverse (666122031), we get a palindrome (796343697).

The spelling of 130221666 in words is "one hundred thirty million, two hundred twenty-one thousand, six hundred sixty-six".