130130320721 has 2 divisors, whose sum is σ = 130130320722. Its totient is φ = 130130320720.

The previous prime is 130130320703. The next prime is 130130320741. The reversal of 130130320721 is 127023031031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78288040000 + 51842280721 = 279800^2 + 227689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-130130320721 is a prime.

It is not a weakly prime, because it can be changed into another prime (130130320741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65065160360 + 65065160361.

It is an arithmetic number, because the mean of its divisors is an integer number (65065160361).

Almost surely, 2^130130320721 is an apocalyptic number.

It is an amenable number.

130130320721 is a deficient number, since it is larger than the sum of its proper divisors (1).

130130320721 is an equidigital number, since it uses as much as digits as its factorization.

130130320721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 23.

Adding to 130130320721 its reverse (127023031031), we get a palindrome (257153351752).

The spelling of 130130320721 in words is "one hundred thirty billion, one hundred thirty million, three hundred twenty thousand, seven hundred twenty-one".