164211321 has 4 divisors (see below), whose sum is σ = 218948432. Its totient is φ = 109474212.

The previous prime is 164211317. The next prime is 164211323. The reversal of 164211321 is 123112461.

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 164211321 - 2² = 164211317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164211323) 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, 27368551 + ... + 27368556.

It is an arithmetic number, because the mean of its divisors is an integer number (54737108).

Almost surely, 2^164211321 is an apocalyptic number.

It is an amenable number.

164211321 is a deficient number, since it is larger than the sum of its proper divisors (54737111).

164211321 is an equidigital number, since it uses as much as digits as its factorization.

164211321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54737110.

The product of its digits is 288, while the sum is 21.

The square root of 164211321 is about 12814.4965176163. The cubic root of 164211321 is about 547.6053699325.

Adding to 164211321 its reverse (123112461), we get a palindrome (287323782).

The spelling of 164211321 in words is "one hundred sixty-four million, two hundred eleven thousand, three hundred twenty-one".