2130212221 has 2 divisors, whose sum is σ = 2130212222. Its totient is φ = 2130212220.

The previous prime is 2130212207. The next prime is 2130212239. The reversal of 2130212221 is 1222120312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2117288196 + 12924025 = 46014^2 + 3595^2 .

It is a cyclic number.

It is not a de Polignac number, because 2130212221 - 2⁹ = 2130211709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2130212195 and 2130212204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2130212261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065106110 + 1065106111.

It is an arithmetic number, because the mean of its divisors is an integer number (1065106111).

Almost surely, 2^2130212221 is an apocalyptic number.

It is an amenable number.

2130212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2130212221 is an equidigital number, since it uses as much as digits as its factorization.

2130212221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2130212221 is about 46154.2221362250. Note that the first 3 decimals coincide. The cubic root of 2130212221 is about 1286.6910812287.

Adding to 2130212221 its reverse (1222120312), we get a palindrome (3352332533).

The spelling of 2130212221 in words is "two billion, one hundred thirty million, two hundred twelve thousand, two hundred twenty-one".