221500006 has 16 divisors (see below), whose sum is σ = 408923424. Its totient is φ = 87626304.

The previous prime is 221499989. The next prime is 221500039. The reversal of 221500006 is 600005122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 608335 + ... + 608698.

It is an arithmetic number, because the mean of its divisors is an integer number (25557714).

Almost surely, 2^221500006 is an apocalyptic number.

221500006 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

221500006 is a deficient number, since it is larger than the sum of its proper divisors (187423418).

221500006 is a wasteful number, since it uses less digits than its factorization.

221500006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217055.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 221500006 is about 14882.8762677112. The cubic root of 221500006 is about 605.0499751537.

Adding to 221500006 its reverse (600005122), we get a palindrome (821505128).

The spelling of 221500006 in words is "two hundred twenty-one million, five hundred thousand, six".