67145321 has 4 divisors (see below), whose sum is σ = 67590144. Its totient is φ = 66700500.

The previous prime is 67145233. The next prime is 67145357. The reversal of 67145321 is 12354176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67145321 - 2²⁶ = 36457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67145381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222185 + ... + 222486.

It is an arithmetic number, because the mean of its divisors is an integer number (16897536).

Almost surely, 2^67145321 is an apocalyptic number.

It is an amenable number.

67145321 is a deficient number, since it is larger than the sum of its proper divisors (444823).

67145321 is a wasteful number, since it uses less digits than its factorization.

67145321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444822.

The product of its digits is 5040, while the sum is 29.

The square root of 67145321 is about 8194.2248565682. The cubic root of 67145321 is about 406.4482438833.

Adding to 67145321 its reverse (12354176), we get a palindrome (79499497).

The spelling of 67145321 in words is "sixty-seven million, one hundred forty-five thousand, three hundred twenty-one".