23204240221 has 2 divisors, whose sum is σ = 23204240222. Its totient is φ = 23204240220.

The previous prime is 23204240203. The next prime is 23204240237. The reversal of 23204240221 is 12204240232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13306776025 + 9897464196 = 115355^2 + 99486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23204240221 is a prime.

It is a super-3 number, since 3×23204240221³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23204240192 and 23204240201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23204240201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11602120110 + 11602120111.

It is an arithmetic number, because the mean of its divisors is an integer number (11602120111).

Almost surely, 2^23204240221 is an apocalyptic number.

It is an amenable number.

23204240221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23204240221 is an equidigital number, since it uses as much as digits as its factorization.

23204240221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 23204240221 its reverse (12204240232), we get a palindrome (35408480453).

The spelling of 23204240221 in words is "twenty-three billion, two hundred four million, two hundred forty thousand, two hundred twenty-one".