23471221 has 2 divisors, whose sum is σ = 23471222. Its totient is φ = 23471220.

The previous prime is 23471191. The next prime is 23471233. The reversal of 23471221 is 12217432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12006225 + 11464996 = 3465^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 23471221 - 2⁹ = 23470709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23471192 and 23471201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23471281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11735610 + 11735611.

It is an arithmetic number, because the mean of its divisors is an integer number (11735611).

Almost surely, 2^23471221 is an apocalyptic number.

It is an amenable number.

23471221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23471221 is an equidigital number, since it uses as much as digits as its factorization.

23471221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 22.

The square root of 23471221 is about 4844.7106208730. The cubic root of 23471221 is about 286.3157425450.

Adding to 23471221 its reverse (12217432), we get a palindrome (35688653).

The spelling of 23471221 in words is "twenty-three million, four hundred seventy-one thousand, two hundred twenty-one".