23680021 has 2 divisors, whose sum is σ = 23680022. Its totient is φ = 23680020.

The previous prime is 23680003. The next prime is 23680051. The reversal of 23680021 is 12008632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12215025 + 11464996 = 3495^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 23680021 - 2⁷ = 23679893 is a prime.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 23679974 and 23680001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23680051) 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, 11840010 + 11840011.

It is an arithmetic number, because the mean of its divisors is an integer number (11840011).

Almost surely, 2^23680021 is an apocalyptic number.

It is an amenable number.

23680021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23680021 is an equidigital number, since it uses as much as digits as its factorization.

23680021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 23680021 is about 4866.2121819748. The cubic root of 23680021 is about 287.1622589702.

Adding to 23680021 its reverse (12008632), we get a palindrome (35688653).

The spelling of 23680021 in words is "twenty-three million, six hundred eighty thousand, twenty-one".