23880821 has 2 divisors, whose sum is σ = 23880822. Its totient is φ = 23880820.

The previous prime is 23880817. The next prime is 23880823. The reversal of 23880821 is 12808832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 8584900 = 3911^2 + 2930^2 .

It is a cyclic number.

It is not a de Polignac number, because 23880821 - 2² = 23880817 is a prime.

It is a super-2 number, since 2×23880821² = 1140587223268082, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 23880823, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23880823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11940410 + 11940411.

It is an arithmetic number, because the mean of its divisors is an integer number (11940411).

Almost surely, 2^23880821 is an apocalyptic number.

It is an amenable number.

23880821 is a deficient number, since it is larger than the sum of its proper divisors (1).

23880821 is an equidigital number, since it uses as much as digits as its factorization.

23880821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 23880821 is about 4886.8006916591. The cubic root of 23880821 is about 287.9716608239.

The spelling of 23880821 in words is "twenty-three million, eight hundred eighty thousand, eight hundred twenty-one".