23261221 has 4 divisors (see below), whose sum is σ = 23335852. Its totient is φ = 23186592.

The previous prime is 23261213. The next prime is 23261239. The reversal of 23261221 is 12216232.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4468996 + 18792225 = 2114^2 + 4335^2 .

It is a cyclic number.

It is not a de Polignac number, because 23261221 - 2³ = 23261213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23261201) 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 in 3 ways as a sum of consecutive naturals, for example, 36846 + ... + 37471.

It is an arithmetic number, because the mean of its divisors is an integer number (5833963).

Almost surely, 2^23261221 is an apocalyptic number.

It is an amenable number.

23261221 is a deficient number, since it is larger than the sum of its proper divisors (74631).

23261221 is an equidigital number, since it uses as much as digits as its factorization.

23261221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74630.

The product of its digits is 288, while the sum is 19.

The square root of 23261221 is about 4822.9888036362. The cubic root of 23261221 is about 285.4592820332.

Adding to 23261221 its reverse (12216232), we get a palindrome (35477453).

The spelling of 23261221 in words is "twenty-three million, two hundred sixty-one thousand, two hundred twenty-one".