221408066 has 16 divisors (see below), whose sum is σ = 367714080. Its totient is φ = 99137280.

The previous prime is 221408063. The next prime is 221408081. The reversal of 221408066 is 660804122.

It is not an unprimeable number, because it can be changed into a prime (221408063) 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 7 ways as a sum of consecutive naturals, for example, 73631 + ... + 76578.

It is an arithmetic number, because the mean of its divisors is an integer number (22982130).

Almost surely, 2^221408066 is an apocalyptic number.

221408066 is a deficient number, since it is larger than the sum of its proper divisors (146306014).

221408066 is a wasteful number, since it uses less digits than its factorization.

221408066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150289.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 221408066 is about 14879.7871624563. The cubic root of 221408066 is about 604.9662490563.

The spelling of 221408066 in words is "two hundred twenty-one million, four hundred eight thousand, sixty-six".