67045221 has 12 divisors (see below), whose sum is σ = 99460972. Its totient is φ = 43488576.

The previous prime is 67045211. The next prime is 67045241. The reversal of 67045221 is 12254076.

It can be written as a sum of positive squares in 2 ways, for example, as 42185025 + 24860196 = 6495^2 + 4986^2 .

It is not a de Polignac number, because 67045221 - 2⁵ = 67045189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67045201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100336 + ... + 101001.

Almost surely, 2^67045221 is an apocalyptic number.

It is an amenable number.

67045221 is a deficient number, since it is larger than the sum of its proper divisors (32415751).

67045221 is a wasteful number, since it uses less digits than its factorization.

67045221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201380 (or 201377 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 67045221 is about 8188.1146181523. The cubic root of 67045221 is about 406.2461662439.

Adding to 67045221 its reverse (12254076), we get a palindrome (79299297).

The spelling of 67045221 in words is "sixty-seven million, forty-five thousand, two hundred twenty-one".