221304023 has 2 divisors, whose sum is σ = 221304024. Its totient is φ = 221304022.

The previous prime is 221303987. The next prime is 221304121. The reversal of 221304023 is 320403122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221304023 - 2⁸ = 221303767 is a prime.

It is equal to p_12190400 and since 221304023 and 12190400 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 221303992 and 221304010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221324023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110652011 + 110652012.

It is an arithmetic number, because the mean of its divisors is an integer number (110652012).

Almost surely, 2^221304023 is an apocalyptic number.

221304023 is a deficient number, since it is larger than the sum of its proper divisors (1).

221304023 is an equidigital number, since it uses as much as digits as its factorization.

221304023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 221304023 is about 14876.2906330846. The cubic root of 221304023 is about 604.8714732782.

Adding to 221304023 its reverse (320403122), we get a palindrome (541707145).

Subtracting 221304023 from its reverse (320403122), we obtain a palindrome (99099099).

The spelling of 221304023 in words is "two hundred twenty-one million, three hundred four thousand, twenty-three".