221474557 has 2 divisors, whose sum is σ = 221474558. Its totient is φ = 221474556.

The previous prime is 221474551. The next prime is 221474647. The reversal of 221474557 is 755474122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168636196 + 52838361 = 12986^2 + 7269^2 .

It is a cyclic number.

It is not a de Polignac number, because 221474557 - 2¹¹ = 221472509 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 (221474551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110737278 + 110737279.

It is an arithmetic number, because the mean of its divisors is an integer number (110737279).

Almost surely, 2^221474557 is an apocalyptic number.

It is an amenable number.

221474557 is a deficient number, since it is larger than the sum of its proper divisors (1).

221474557 is an equidigital number, since it uses as much as digits as its factorization.

221474557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78400, while the sum is 37.

The square root of 221474557 is about 14882.0212672876. The cubic root of 221474557 is about 605.0268020820.

The spelling of 221474557 in words is "two hundred twenty-one million, four hundred seventy-four thousand, five hundred fifty-seven".