221506006 has 16 divisors (see below), whose sum is σ = 338246208. Its totient is φ = 108763200.

The previous prime is 221505989. The next prime is 221506049. The reversal of 221506006 is 600605122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110146 + ... + 112138.

It is an arithmetic number, because the mean of its divisors is an integer number (21140388).

Almost surely, 2^221506006 is an apocalyptic number.

221506006 is a deficient number, since it is larger than the sum of its proper divisors (116740202).

221506006 is a wasteful number, since it uses less digits than its factorization.

221506006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 221506006 is about 14883.0778402856. The cubic root of 221506006 is about 605.0554383094.

The spelling of 221506006 in words is "two hundred twenty-one million, five hundred six thousand, six".