21230130217 has 2 divisors, whose sum is σ = 21230130218. Its totient is φ = 21230130216.

The previous prime is 21230130199. The next prime is 21230130277. The reversal of 21230130217 is 71203103212.

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., 13518480361 + 7711649856 = 116269^2 + 87816^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230130217 - 2²³ = 21221741609 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230130277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615065108 + 10615065109.

It is an arithmetic number, because the mean of its divisors is an integer number (10615065109).

Almost surely, 2^21230130217 is an apocalyptic number.

It is an amenable number.

21230130217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230130217 is an equidigital number, since it uses as much as digits as its factorization.

21230130217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 21230130217 its reverse (71203103212), we get a palindrome (92433233429).

The spelling of 21230130217 in words is "twenty-one billion, two hundred thirty million, one hundred thirty thousand, two hundred seventeen".