221030647 has 2 divisors, whose sum is σ = 221030648. Its totient is φ = 221030646.

The previous prime is 221030639. The next prime is 221030657. The reversal of 221030647 is 746030122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221030647 - 2³ = 221030639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221030627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110515323 + 110515324.

It is an arithmetic number, because the mean of its divisors is an integer number (110515324).

Almost surely, 2^221030647 is an apocalyptic number.

221030647 is a deficient number, since it is larger than the sum of its proper divisors (1).

221030647 is an equidigital number, since it uses as much as digits as its factorization.

221030647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 221030647 is about 14867.0994817416. The cubic root of 221030647 is about 604.6223055242.

Adding to 221030647 its reverse (746030122), we get a palindrome (967060769).

The spelling of 221030647 in words is "two hundred twenty-one million, thirty thousand, six hundred forty-seven".