23211121 has 2 divisors, whose sum is σ = 23211122. Its totient is φ = 23211120.

The previous prime is 23211119. The next prime is 23211143. The reversal of 23211121 is 12111232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23184225 + 26896 = 4815^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 23211121 - 2¹ = 23211119 is a prime.

It is a super-2 number, since 2×23211121² = 1077512276153282, which contains 22 as substring.

Together with 23211119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23211101) 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, 11605560 + 11605561.

It is an arithmetic number, because the mean of its divisors is an integer number (11605561).

Almost surely, 2^23211121 is an apocalyptic number.

It is an amenable number.

23211121 is a deficient number, since it is larger than the sum of its proper divisors (1).

23211121 is an equidigital number, since it uses as much as digits as its factorization.

23211121 is an odious number, because the sum of its binary digits is odd.

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

The square root of 23211121 is about 4817.7921291812. The cubic root of 23211121 is about 285.2541940621.

Adding to 23211121 its reverse (12111232), we get a palindrome (35322353).

It can be divided in two parts, 23211 and 121, that added together give a palindrome (23332).

The spelling of 23211121 in words is "twenty-three million, two hundred eleven thousand, one hundred twenty-one".