21230130461 has 2 divisors, whose sum is σ = 21230130462. Its totient is φ = 21230130460.

The previous prime is 21230130277. The next prime is 21230130463. The reversal of 21230130461 is 16403103212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21058363225 + 171767236 = 145115^2 + 13106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230130461 is a prime.

Together with 21230130463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230130463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615065230 + 10615065231.

It is an arithmetic number, because the mean of its divisors is an integer number (10615065231).

Almost surely, 2^21230130461 is an apocalyptic number.

It is an amenable number.

21230130461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230130461 is an equidigital number, since it uses as much as digits as its factorization.

21230130461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21230130461 its reverse (16403103212), we get a palindrome (37633233673).

The spelling of 21230130461 in words is "twenty-one billion, two hundred thirty million, one hundred thirty thousand, four hundred sixty-one".