164312221 has 8 divisors (see below), whose sum is σ = 165328704. Its totient is φ = 163299360.

The previous prime is 164312201. The next prime is 164312251. The reversal of 164312221 is 122213461.

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 164312221 - 2⁵ = 164312189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164312192 and 164312201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164312201) 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, 208390 + ... + 209176.

It is an arithmetic number, because the mean of its divisors is an integer number (20666088).

Almost surely, 2^164312221 is an apocalyptic number.

It is an amenable number.

164312221 is a deficient number, since it is larger than the sum of its proper divisors (1016483).

164312221 is an equidigital number, since it uses as much as digits as its factorization.

164312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811.

The product of its digits is 576, while the sum is 22.

The square root of 164312221 is about 12818.4328605333. The cubic root of 164312221 is about 547.7175060680.

Adding to 164312221 its reverse (122213461), we get a palindrome (286525682).

The spelling of 164312221 in words is "one hundred sixty-four million, three hundred twelve thousand, two hundred twenty-one".