23821121 has 2 divisors, whose sum is σ = 23821122. Its totient is φ = 23821120.

The previous prime is 23821111. The next prime is 23821129. The reversal of 23821121 is 12112832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16313521 + 7507600 = 4039^2 + 2740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23821121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23821093 and 23821102.

It is not a weakly prime, because it can be changed into another prime (23821129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11910560 + 11910561.

It is an arithmetic number, because the mean of its divisors is an integer number (11910561).

Almost surely, 2^23821121 is an apocalyptic number.

It is an amenable number.

23821121 is a deficient number, since it is larger than the sum of its proper divisors (1).

23821121 is an equidigital number, since it uses as much as digits as its factorization.

23821121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 20.

The square root of 23821121 is about 4880.6885784692. The cubic root of 23821121 is about 287.7314924453.

Adding to 23821121 its reverse (12112832), we get a palindrome (35933953).

The spelling of 23821121 in words is "twenty-three million, eight hundred twenty-one thousand, one hundred twenty-one".