221006147 has 2 divisors, whose sum is σ = 221006148. Its totient is φ = 221006146.

The previous prime is 221006141. The next prime is 221006183. The reversal of 221006147 is 741600122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221006147 - 2¹² = 221002051 is a prime.

It is not a weakly prime, because it can be changed into another prime (221006141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110503073 + 110503074.

It is an arithmetic number, because the mean of its divisors is an integer number (110503074).

Almost surely, 2^221006147 is an apocalyptic number.

221006147 is a deficient number, since it is larger than the sum of its proper divisors (1).

221006147 is an equidigital number, since it uses as much as digits as its factorization.

221006147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 221006147 is about 14866.2754918641. The cubic root of 221006147 is about 604.5999650418.

Adding to 221006147 its reverse (741600122), we get a palindrome (962606269).

The spelling of 221006147 in words is "two hundred twenty-one million, six thousand, one hundred forty-seven".