221475841 has 2 divisors, whose sum is σ = 221475842. Its totient is φ = 221475840.

The previous prime is 221475829. The next prime is 221475887. The reversal of 221475841 is 148574122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204633025 + 16842816 = 14305^2 + 4104^2 .

It is a cyclic number.

It is not a de Polignac number, because 221475841 - 2⁷ = 221475713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221475797 and 221475806.

It is not a weakly prime, because it can be changed into another prime (251475841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110737920 + 110737921.

It is an arithmetic number, because the mean of its divisors is an integer number (110737921).

Almost surely, 2^221475841 is an apocalyptic number.

It is an amenable number.

221475841 is a deficient number, since it is larger than the sum of its proper divisors (1).

221475841 is an equidigital number, since it uses as much as digits as its factorization.

221475841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17920, while the sum is 34.

The square root of 221475841 is about 14882.0644065264. The cubic root of 221475841 is about 605.0279712952.

The spelling of 221475841 in words is "two hundred twenty-one million, four hundred seventy-five thousand, eight hundred forty-one".