221348066 has 4 divisors (see below), whose sum is σ = 332022102. Its totient is φ = 110674032.

The previous prime is 221348059. The next prime is 221348069. The reversal of 221348066 is 660843122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660843122 = 2 ⋅330421561.

It can be written as a sum of positive squares in only one way, i.e., 149352841 + 71995225 = 12221^2 + 8485^2 .

It is not an unprimeable number, because it can be changed into a prime (221348069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55337015 + ... + 55337018.

Almost surely, 2^221348066 is an apocalyptic number.

221348066 is a deficient number, since it is larger than the sum of its proper divisors (110674036).

221348066 is a wasteful number, since it uses less digits than its factorization.

221348066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110674035.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 221348066 is about 14877.7708679762. The cubic root of 221348066 is about 604.9115969458.

The spelling of 221348066 in words is "two hundred twenty-one million, three hundred forty-eight thousand, sixty-six".