221422307 has 2 divisors, whose sum is σ = 221422308. Its totient is φ = 221422306.

The previous prime is 221422291. The next prime is 221422309. The reversal of 221422307 is 703224122.

It is a happy number.

221422307 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221422307 - 2⁴ = 221422291 is a prime.

Together with 221422309, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221422309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110711153 + 110711154.

It is an arithmetic number, because the mean of its divisors is an integer number (110711154).

Almost surely, 2^221422307 is an apocalyptic number.

221422307 is a deficient number, since it is larger than the sum of its proper divisors (1).

221422307 is an equidigital number, since it uses as much as digits as its factorization.

221422307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 221422307 is about 14880.2656898323. The cubic root of 221422307 is about 604.9792192849.

Adding to 221422307 its reverse (703224122), we get a palindrome (924646429).

The spelling of 221422307 in words is "two hundred twenty-one million, four hundred twenty-two thousand, three hundred seven".