213121213323 has 16 divisors (see below), whose sum is σ = 287055487776. Its totient is φ = 140634662400.

The previous prime is 213121213309. The next prime is 213121213339. The reversal of 213121213323 is 323312121312.

213121213323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213121213323 - 2¹⁰ = 213121212299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213121213293 and 213121213302.

It is not an unprimeable number, because it can be changed into a prime (213121213343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1005315 + ... + 1198707.

It is an arithmetic number, because the mean of its divisors is an integer number (17940967986).

Almost surely, 2^213121213323 is an apocalyptic number.

213121213323 is a deficient number, since it is larger than the sum of its proper divisors (73934274453).

213121213323 is a wasteful number, since it uses less digits than its factorization.

213121213323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197134.

The product of its digits is 1296, while the sum is 24.

Adding to 213121213323 its reverse (323312121312), we get a palindrome (536433334635).

The spelling of 213121213323 in words is "two hundred thirteen billion, one hundred twenty-one million, two hundred thirteen thousand, three hundred twenty-three".