221476897 has 4 divisors (see below), whose sum is σ = 221806660. Its totient is φ = 221147136.

The previous prime is 221476889. The next prime is 221476919. The reversal of 221476897 is 798674122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798674122 = 2 ⋅399337061.

It can be written as a sum of positive squares in 2 ways, for example, as 60466176 + 161010721 = 7776^2 + 12689^2 .

It is a cyclic number.

It is not a de Polignac number, because 221476897 - 2³ = 221476889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221476807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163872 + ... + 165217.

It is an arithmetic number, because the mean of its divisors is an integer number (55451665).

Almost surely, 2^221476897 is an apocalyptic number.

It is an amenable number.

221476897 is a deficient number, since it is larger than the sum of its proper divisors (329763).

221476897 is an equidigital number, since it uses as much as digits as its factorization.

221476897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329762.

The product of its digits is 338688, while the sum is 46.

The square root of 221476897 is about 14882.0998854328. The cubic root of 221476897 is about 605.0289328877.

The spelling of 221476897 in words is "two hundred twenty-one million, four hundred seventy-six thousand, eight hundred ninety-seven".