221385847 has 2 divisors, whose sum is σ = 221385848. Its totient is φ = 221385846.

The previous prime is 221385821. The next prime is 221385869. The reversal of 221385847 is 748583122.

It is a happy number.

221385847 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 221385847 - 2¹⁹ = 220861559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221385547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110692923 + 110692924.

It is an arithmetic number, because the mean of its divisors is an integer number (110692924).

Almost surely, 2^221385847 is an apocalyptic number.

221385847 is a deficient number, since it is larger than the sum of its proper divisors (1).

221385847 is an equidigital number, since it uses as much as digits as its factorization.

221385847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 40.

The square root of 221385847 is about 14879.0405268619. The cubic root of 221385847 is about 604.9460116202.

The spelling of 221385847 in words is "two hundred twenty-one million, three hundred eighty-five thousand, eight hundred forty-seven".