221500005 has 32 divisors (see below), whose sum is σ = 389283840. Its totient is φ = 107046720.

The previous prime is 221499989. The next prime is 221500039. The reversal of 221500005 is 500005122.

It is not a de Polignac number, because 221500005 - 2⁴ = 221499989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10341 + ... + 23450.

It is an arithmetic number, because the mean of its divisors is an integer number (12165120).

Almost surely, 2^221500005 is an apocalyptic number.

It is an amenable number.

221500005 is a deficient number, since it is larger than the sum of its proper divisors (167783835).

221500005 is a wasteful number, since it uses less digits than its factorization.

221500005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33841.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 221500005 is about 14882.8762341155. The cubic root of 221500005 is about 605.0499742432.

Adding to 221500005 its reverse (500005122), we get a palindrome (721505127).

The spelling of 221500005 in words is "two hundred twenty-one million, five hundred thousand, five".