67912221 has 8 divisors (see below), whose sum is σ = 97515040. Its totient is φ = 41792112.

The previous prime is 67912199. The next prime is 67912223. The reversal of 67912221 is 12221976.

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

It is not a de Polignac number, because 67912221 - 2⁵ = 67912189 is a prime.

It is a super-2 number, since 2×67912221² = 9224139522305682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67912223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 870631 + ... + 870708.

It is an arithmetic number, because the mean of its divisors is an integer number (12189380).

Almost surely, 2^67912221 is an apocalyptic number.

It is an amenable number.

67912221 is a deficient number, since it is larger than the sum of its proper divisors (29602819).

67912221 is a wasteful number, since it uses less digits than its factorization.

67912221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1741355.

The product of its digits is 3024, while the sum is 30.

The square root of 67912221 is about 8240.8871488451. The cubic root of 67912221 is about 407.9898053489.

The spelling of 67912221 in words is "sixty-seven million, nine hundred twelve thousand, two hundred twenty-one".