221365223 has 2 divisors, whose sum is σ = 221365224. Its totient is φ = 221365222.

The previous prime is 221365217. The next prime is 221365297. The reversal of 221365223 is 322563122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221365223 - 2¹⁴ = 221348839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221365192 and 221365201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221362223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110682611 + 110682612.

It is an arithmetic number, because the mean of its divisors is an integer number (110682612).

Almost surely, 2^221365223 is an apocalyptic number.

221365223 is a deficient number, since it is larger than the sum of its proper divisors (1).

221365223 is an equidigital number, since it uses as much as digits as its factorization.

221365223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 26.

The square root of 221365223 is about 14878.3474552788. The cubic root of 221365223 is about 604.9272257250.

The spelling of 221365223 in words is "two hundred twenty-one million, three hundred sixty-five thousand, two hundred twenty-three".