23243021 has 2 divisors, whose sum is σ = 23243022. Its totient is φ = 23243020.

The previous prime is 23242987. The next prime is 23243047. The reversal of 23243021 is 12034232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21252100 + 1990921 = 4610^2 + 1411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23243021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23243221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11621510 + 11621511.

It is an arithmetic number, because the mean of its divisors is an integer number (11621511).

Almost surely, 2^23243021 is an apocalyptic number.

It is an amenable number.

23243021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23243021 is an equidigital number, since it uses as much as digits as its factorization.

23243021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 23243021 is about 4821.1016375928. The cubic root of 23243021 is about 285.3848131062.

Adding to 23243021 its reverse (12034232), we get a palindrome (35277253).

The spelling of 23243021 in words is "twenty-three million, two hundred forty-three thousand, twenty-one".