221023423 has 2 divisors, whose sum is σ = 221023424. Its totient is φ = 221023422.

The previous prime is 221023417. The next prime is 221023427. The reversal of 221023423 is 324320122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221023423 - 2⁵ = 221023391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221023423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221023427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110511711 + 110511712.

It is an arithmetic number, because the mean of its divisors is an integer number (110511712).

Almost surely, 2^221023423 is an apocalyptic number.

221023423 is a deficient number, since it is larger than the sum of its proper divisors (1).

221023423 is an equidigital number, since it uses as much as digits as its factorization.

221023423 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 221023423 is about 14866.8565271883. The cubic root of 221023423 is about 604.6157184450.

Adding to 221023423 its reverse (324320122), we get a palindrome (545343545).

The spelling of 221023423 in words is "two hundred twenty-one million, twenty-three thousand, four hundred twenty-three".