221223307 has 2 divisors, whose sum is σ = 221223308. Its totient is φ = 221223306.

The previous prime is 221223293. The next prime is 221223311. The reversal of 221223307 is 703322122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221223307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221223337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611653 + 110611654.

It is an arithmetic number, because the mean of its divisors is an integer number (110611654).

Almost surely, 2^221223307 is an apocalyptic number.

221223307 is a deficient number, since it is larger than the sum of its proper divisors (1).

221223307 is an equidigital number, since it uses as much as digits as its factorization.

221223307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 221223307 is about 14873.5774781994. The cubic root of 221223307 is about 604.7979262755.

Adding to 221223307 its reverse (703322122), we get a palindrome (924545429).

The spelling of 221223307 in words is "two hundred twenty-one million, two hundred twenty-three thousand, three hundred seven".