23121211 has 4 divisors (see below), whose sum is σ = 23359672. Its totient is φ = 22882752.

The previous prime is 23121209. The next prime is 23121247. The reversal of 23121211 is 11212132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23121211 - 2¹ = 23121209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23121191 and 23121200.

It is not an unprimeable number, because it can be changed into a prime (23121281) 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 in 3 ways as a sum of consecutive naturals, for example, 119085 + ... + 119278.

It is an arithmetic number, because the mean of its divisors is an integer number (5839918).

Almost surely, 2^23121211 is an apocalyptic number.

23121211 is a deficient number, since it is larger than the sum of its proper divisors (238461).

23121211 is an equidigital number, since it uses as much as digits as its factorization.

23121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238460.

The product of its digits is 24, while the sum is 13.

The square root of 23121211 is about 4808.4520378184. The cubic root of 23121211 is about 284.8853997029.

Adding to 23121211 its reverse (11212132), we get a palindrome (34333343).

It can be divided in two parts, 23121 and 211, that added together give a palindrome (23332).

The spelling of 23121211 in words is "twenty-three million, one hundred twenty-one thousand, two hundred eleven".