23967221 has 2 divisors, whose sum is σ = 23967222. Its totient is φ = 23967220.

The previous prime is 23967197. The next prime is 23967241. The reversal of 23967221 is 12276932.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20376196 + 3591025 = 4514^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 23967221 - 2¹⁰ = 23966197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23967241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11983610 + 11983611.

It is an arithmetic number, because the mean of its divisors is an integer number (11983611).

Almost surely, 2^23967221 is an apocalyptic number.

It is an amenable number.

23967221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23967221 is an equidigital number, since it uses as much as digits as its factorization.

23967221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 23967221 is about 4895.6328497958. The cubic root of 23967221 is about 288.3185334008.

The spelling of 23967221 in words is "twenty-three million, nine hundred sixty-seven thousand, two hundred twenty-one".