213121323 has 12 divisors (see below), whose sum is σ = 309225280. Its totient is φ = 141442416.

The previous prime is 213121313. The next prime is 213121343. The reversal of 213121323 is 323121312.

It is not a de Polignac number, because 213121323 - 2⁸ = 213121067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213121296 and 213121305.

It is not an unprimeable number, because it can be changed into a prime (213121303) 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 11 ways as a sum of consecutive naturals, for example, 51088 + ... + 55101.

Almost surely, 2^213121323 is an apocalyptic number.

213121323 is a deficient number, since it is larger than the sum of its proper divisors (96103957).

213121323 is a wasteful number, since it uses less digits than its factorization.

213121323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106418 (or 106415 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 213121323 is about 14598.6753851163. The cubic root of 213121323 is about 597.3226289107.

Adding to 213121323 its reverse (323121312), we get a palindrome (536242635).

It can be divided in two parts, 213121 and 323, that added together give a square (213444 = 462²).

The spelling of 213121323 in words is "two hundred thirteen million, one hundred twenty-one thousand, three hundred twenty-three".