221148047 has 2 divisors, whose sum is σ = 221148048. Its totient is φ = 221148046.

The previous prime is 221148041. The next prime is 221148071. The reversal of 221148047 is 740841122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221148047 - 2²⁰ = 220099471 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221148041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110574023 + 110574024.

It is an arithmetic number, because the mean of its divisors is an integer number (110574024).

Almost surely, 2^221148047 is an apocalyptic number.

221148047 is a deficient number, since it is larger than the sum of its proper divisors (1).

221148047 is an equidigital number, since it uses as much as digits as its factorization.

221148047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 221148047 is about 14871.0472731412. The cubic root of 221148047 is about 604.7293345658.

Adding to 221148047 its reverse (740841122), we get a palindrome (961989169).

The spelling of 221148047 in words is "two hundred twenty-one million, one hundred forty-eight thousand, forty-seven".