67421217 has 8 divisors (see below), whose sum is σ = 89963424. Its totient is φ = 44913248.

The previous prime is 67421213. The next prime is 67421219. The reversal of 67421217 is 71212476.

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

It is a cyclic number.

It is not a de Polignac number, because 67421217 - 2² = 67421213 is a prime.

It is a super-2 number, since 2×67421217² = 9091241003522178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67421213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3543 + ... + 12140.

It is an arithmetic number, because the mean of its divisors is an integer number (11245428).

Almost surely, 2^67421217 is an apocalyptic number.

It is an amenable number.

67421217 is a deficient number, since it is larger than the sum of its proper divisors (22542207).

67421217 is a wasteful number, since it uses less digits than its factorization.

67421217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17119.

The product of its digits is 4704, while the sum is 30.

The square root of 67421217 is about 8211.0423820609. The cubic root of 67421217 is about 407.0041734405.

The spelling of 67421217 in words is "sixty-seven million, four hundred twenty-one thousand, two hundred seventeen".