130870021 has 2 divisors, whose sum is σ = 130870022. Its totient is φ = 130870020.

The previous prime is 130870013. The next prime is 130870141. The reversal of 130870021 is 120078031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122102500 + 8767521 = 11050^2 + 2961^2 .

It is a cyclic number.

It is not a de Polignac number, because 130870021 - 2³ = 130870013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 130869974 and 130870001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130870321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65435010 + 65435011.

It is an arithmetic number, because the mean of its divisors is an integer number (65435011).

Almost surely, 2^130870021 is an apocalyptic number.

It is an amenable number.

130870021 is a deficient number, since it is larger than the sum of its proper divisors (1).

130870021 is an equidigital number, since it uses as much as digits as its factorization.

130870021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 130870021 is about 11439.8435741054. The cubic root of 130870021 is about 507.7072799009.

The spelling of 130870021 in words is "one hundred thirty million, eight hundred seventy thousand, twenty-one".