221416145 has 8 divisors (see below), whose sum is σ = 265847400. Its totient is φ = 177034240.

The previous prime is 221416141. The next prime is 221416187. The reversal of 221416145 is 541614122.

It can be written as a sum of positive squares in 4 ways, for example, as 38950081 + 182466064 = 6241^2 + 13508^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221416145 - 2² = 221416141 is a prime.

It is a super-2 number, since 2×221416145² = 98050218533322050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221416141) 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 7 ways as a sum of consecutive naturals, for example, 1616 + ... + 21105.

It is an arithmetic number, because the mean of its divisors is an integer number (33230925).

Almost surely, 2^221416145 is an apocalyptic number.

It is an amenable number.

221416145 is a deficient number, since it is larger than the sum of its proper divisors (44431255).

221416145 is a wasteful number, since it uses less digits than its factorization.

221416145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24675.

The product of its digits is 1920, while the sum is 26.

The square root of 221416145 is about 14880.0586356372. The cubic root of 221416145 is about 604.9736072087.

The spelling of 221416145 in words is "two hundred twenty-one million, four hundred sixteen thousand, one hundred forty-five".