221415001 has 4 divisors (see below), whose sum is σ = 223902900. Its totient is φ = 218927104.

The previous prime is 221414969. The next prime is 221415017. The reversal of 221415001 is 100514122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 93702400 + 127712601 = 9680^2 + 11301^2 .

It is a cyclic number.

It is not a de Polignac number, because 221415001 - 2⁵ = 221414969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221415071) 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 3 ways as a sum of consecutive naturals, for example, 1243816 + ... + 1243993.

It is an arithmetic number, because the mean of its divisors is an integer number (55975725).

Almost surely, 2^221415001 is an apocalyptic number.

It is an amenable number.

221415001 is a deficient number, since it is larger than the sum of its proper divisors (2487899).

221415001 is an equidigital number, since it uses as much as digits as its factorization.

221415001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487898.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 221415001 is about 14880.0201948788. The cubic root of 221415001 is about 604.9725652928.

Adding to 221415001 its reverse (100514122), we get a palindrome (321929123).

The spelling of 221415001 in words is "two hundred twenty-one million, four hundred fifteen thousand, one".