67408221 has 4 divisors (see below), whose sum is σ = 89877632. Its totient is φ = 44938812.

The previous prime is 67408207. The next prime is 67408241. The reversal of 67408221 is 12280476.

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 not a de Polignac number, because 67408221 - 2⁶ = 67408157 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 (67408241) 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, 11234701 + ... + 11234706.

It is an arithmetic number, because the mean of its divisors is an integer number (22469408).

Almost surely, 2^67408221 is an apocalyptic number.

It is an amenable number.

67408221 is a deficient number, since it is larger than the sum of its proper divisors (22469411).

67408221 is a wasteful number, since it uses less digits than its factorization.

67408221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22469410.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 67408221 is about 8210.2509705855. The cubic root of 67408221 is about 406.9780206142.

Adding to 67408221 its reverse (12280476), we get a palindrome (79688697).

The spelling of 67408221 in words is "sixty-seven million, four hundred eight thousand, two hundred twenty-one".