23897221 has 2 divisors, whose sum is σ = 23897222. Its totient is φ = 23897220.

The previous prime is 23897201. The next prime is 23897233. The reversal of 23897221 is 12279832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21288996 + 2608225 = 4614^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 23897221 - 2²³ = 15508613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23897201) 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, 11948610 + 11948611.

It is an arithmetic number, because the mean of its divisors is an integer number (11948611).

Almost surely, 2^23897221 is an apocalyptic number.

It is an amenable number.

23897221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23897221 is an equidigital number, since it uses as much as digits as its factorization.

23897221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 23897221 is about 4888.4783931199. The cubic root of 23897221 is about 288.0375666338.

The spelling of 23897221 in words is "twenty-three million, eight hundred ninety-seven thousand, two hundred twenty-one".