1210130021 has 2 divisors, whose sum is σ = 1210130022. Its totient is φ = 1210130020.

The previous prime is 1210130011. The next prime is 1210130039. The reversal of 1210130021 is 1200310121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1204437025 + 5692996 = 34705^2 + 2386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210130021 - 2¹⁴ = 1210113637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210129984 and 1210130011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210130011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605065010 + 605065011.

It is an arithmetic number, because the mean of its divisors is an integer number (605065011).

Almost surely, 2^1210130021 is an apocalyptic number.

It is an amenable number.

1210130021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210130021 is an equidigital number, since it uses as much as digits as its factorization.

1210130021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1210130021 is about 34786.9231321196. The cubic root of 1210130021 is about 1065.6404036278.

Adding to 1210130021 its reverse (1200310121), we get a palindrome (2410440142).

The spelling of 1210130021 in words is "one billion, two hundred ten million, one hundred thirty thousand, twenty-one".