221002115 has 4 divisors (see below), whose sum is σ = 265202544. Its totient is φ = 176801688.

The previous prime is 221002097. The next prime is 221002121. The reversal of 221002115 is 511200122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221002115 - 2⁶ = 221002051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221002115.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 22100207 + ... + 22100216.

It is an arithmetic number, because the mean of its divisors is an integer number (66300636).

Almost surely, 2^221002115 is an apocalyptic number.

221002115 is a deficient number, since it is larger than the sum of its proper divisors (44200429).

221002115 is an equidigital number, since it uses as much as digits as its factorization.

221002115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44200428.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 221002115 is about 14866.1398822963. The cubic root of 221002115 is about 604.5962882785.

Adding to 221002115 its reverse (511200122), we get a palindrome (732202237).

The spelling of 221002115 in words is "two hundred twenty-one million, two thousand, one hundred fifteen".