21230033257 has 2 divisors, whose sum is σ = 21230033258. Its totient is φ = 21230033256.

The previous prime is 21230033221. The next prime is 21230033261. The reversal of 21230033257 is 75233003212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12388580416 + 8841452841 = 111304^2 + 94029^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230033257 - 2³¹ = 19082549609 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230030257) 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, 10615016628 + 10615016629.

It is an arithmetic number, because the mean of its divisors is an integer number (10615016629).

Almost surely, 2^21230033257 is an apocalyptic number.

It is an amenable number.

21230033257 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230033257 is an equidigital number, since it uses as much as digits as its factorization.

21230033257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 28.

Adding to 21230033257 its reverse (75233003212), we get a palindrome (96463036469).

The spelling of 21230033257 in words is "twenty-one billion, two hundred thirty million, thirty-three thousand, two hundred fifty-seven".