323212121 has 4 divisors (see below), whose sum is σ = 324744144. Its totient is φ = 321680100.

The previous prime is 323212111. The next prime is 323212139. The reversal of 323212121 is 121212323.

323212121 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121212323 = 23 ⋅5270101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-323212121 is a prime.

It is a super-2 number, since 2×323212121² = 208932150322637282, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 323212121.

It is not an unprimeable number, because it can be changed into a prime (323212111) 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, 765695 + ... + 766116.

It is an arithmetic number, because the mean of its divisors is an integer number (81186036).

Almost surely, 2^323212121 is an apocalyptic number.

It is an amenable number.

323212121 is a deficient number, since it is larger than the sum of its proper divisors (1532023).

323212121 is a wasteful number, since it uses less digits than its factorization.

323212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532022.

The product of its digits is 144, while the sum is 17.

The square root of 323212121 is about 17978.1011511227. The cubic root of 323212121 is about 686.2713675341.

Adding to 323212121 its reverse (121212323), we get a palindrome (444424444).

The spelling of 323212121 in words is "three hundred twenty-three million, two hundred twelve thousand, one hundred twenty-one".