23147221 has 2 divisors, whose sum is σ = 23147222. Its totient is φ = 23147220.

The previous prime is 23147197. The next prime is 23147231. The reversal of 23147221 is 12274132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13468900 + 9678321 = 3670^2 + 3111^2 .

It is a cyclic number.

It is not a de Polignac number, because 23147221 - 2⁹ = 23146709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23147192 and 23147201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23147231) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11573610 + 11573611.

It is an arithmetic number, because the mean of its divisors is an integer number (11573611).

Almost surely, 2^23147221 is an apocalyptic number.

It is an amenable number.

23147221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23147221 is an equidigital number, since it uses as much as digits as its factorization.

23147221 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 23147221 is about 4811.1558902201. The cubic root of 23147221 is about 284.9921860995.

The spelling of 23147221 in words is "twenty-three million, one hundred forty-seven thousand, two hundred twenty-one".