221335145 has 16 divisors (see below), whose sum is σ = 271978128. Its totient is φ = 172861440.

The previous prime is 221335129. The next prime is 221335159. The reversal of 221335145 is 541533122.

It is a happy number.

221335145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 5480281 + 215854864 = 2341^2 + 14692^2 .

It is not a de Polignac number, because 221335145 - 2⁴ = 221335129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39137 + ... + 44433.

It is an arithmetic number, because the mean of its divisors is an integer number (16998633).

Almost surely, 2^221335145 is an apocalyptic number.

It is an amenable number.

221335145 is a deficient number, since it is larger than the sum of its proper divisors (50642983).

221335145 is a wasteful number, since it uses less digits than its factorization.

221335145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5500.

The product of its digits is 3600, while the sum is 26.

The square root of 221335145 is about 14877.3366231997. The cubic root of 221335145 is about 604.8998263214.

Adding to 221335145 its reverse (541533122), we get a palindrome (762868267).

The spelling of 221335145 in words is "two hundred twenty-one million, three hundred thirty-five thousand, one hundred forty-five".