667007221 has 8 divisors (see below), whose sum is σ = 704689920. Its totient is φ = 630303408.

The previous prime is 667007219. The next prime is 667007273. The reversal of 667007221 is 122700766.

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 667007221 - 2¹ = 667007219 is a prime.

It is a super-2 number, since 2×667007221² = 889797265732285682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667007321) 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 7 ways as a sum of consecutive naturals, for example, 243321 + ... + 246046.

It is an arithmetic number, because the mean of its divisors is an integer number (88086240).

Almost surely, 2^667007221 is an apocalyptic number.

It is an amenable number.

667007221 is a deficient number, since it is larger than the sum of its proper divisors (37682699).

667007221 is a wasteful number, since it uses less digits than its factorization.

667007221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489443.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 667007221 is about 25826.4829390299. The cubic root of 667007221 is about 873.7291902210.

Adding to 667007221 its reverse (122700766), we get a palindrome (789707987).

The spelling of 667007221 in words is "six hundred sixty-seven million, seven thousand, two hundred twenty-one".