212121323321 has 4 divisors (see below), whose sum is σ = 212139482100. Its totient is φ = 212103164544.

The previous prime is 212121323303. The next prime is 212121323371. The reversal of 212121323321 is 123323121212.

212121323321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130090062400 + 82031260921 = 360680^2 + 286411^2 .

It is a cyclic number.

It is not a de Polignac number, because 212121323321 - 2⁶ = 212121323257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212121323371) 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 3 ways as a sum of consecutive naturals, for example, 9061856 + ... + 9085233.

It is an arithmetic number, because the mean of its divisors is an integer number (53034870525).

Almost surely, 2^212121323321 is an apocalyptic number.

It is an amenable number.

212121323321 is a deficient number, since it is larger than the sum of its proper divisors (18158779).

212121323321 is a wasteful number, since it uses less digits than its factorization.

212121323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18158778.

The product of its digits is 864, while the sum is 23.

Adding to 212121323321 its reverse (123323121212), we get a palindrome (335444444533).

The spelling of 212121323321 in words is "two hundred twelve billion, one hundred twenty-one million, three hundred twenty-three thousand, three hundred twenty-one".