212002323221 has 4 divisors (see below), whose sum is σ = 228310194252. Its totient is φ = 195694452192.

The previous prime is 212002323139. The next prime is 212002323223. The reversal of 212002323221 is 122323200212.

It is a happy number.

212002323221 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 98981968996 + 113020354225 = 314614^2 + 336185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212002323221 is a prime.

It is a super-2 number, since 2×212002323221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212002323193 and 212002323202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212002323223) 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, 8153935496 + ... + 8153935521.

It is an arithmetic number, because the mean of its divisors is an integer number (57077548563).

Almost surely, 2^212002323221 is an apocalyptic number.

It is an amenable number.

212002323221 is a deficient number, since it is larger than the sum of its proper divisors (16307871031).

212002323221 is a wasteful number, since it uses less digits than its factorization.

212002323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16307871030.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 212002323221 its reverse (122323200212), we get a palindrome (334325523433).

The spelling of 212002323221 in words is "two hundred twelve billion, two million, three hundred twenty-three thousand, two hundred twenty-one".