221243023 has 2 divisors, whose sum is σ = 221243024. Its totient is φ = 221243022.

The previous prime is 221243021. The next prime is 221243051. The reversal of 221243023 is 320342122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221243023 - 2¹ = 221243021 is a prime.

Together with 221243021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221243021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110621511 + 110621512.

It is an arithmetic number, because the mean of its divisors is an integer number (110621512).

Almost surely, 2^221243023 is an apocalyptic number.

221243023 is a deficient number, since it is larger than the sum of its proper divisors (1).

221243023 is an equidigital number, since it uses as much as digits as its factorization.

221243023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 221243023 is about 14874.2402495052. The cubic root of 221243023 is about 604.8158927997.

Adding to 221243023 its reverse (320342122), we get a palindrome (541585145).

Subtracting 221243023 from its reverse (320342122), we obtain a palindrome (99099099).

The spelling of 221243023 in words is "two hundred twenty-one million, two hundred forty-three thousand, twenty-three".