212102230321 has 4 divisors (see below), whose sum is σ = 212826129012. Its totient is φ = 211378331632.

The previous prime is 212102230283. The next prime is 212102230343. The reversal of 212102230321 is 123032201212.

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 179797200625 + 32305029696 = 424025^2 + 179736^2 .

It is a cyclic number.

It is not a de Polignac number, because 212102230321 - 2¹⁵ = 212102197553 is a prime.

It is a super-2 number, since 2×212102230321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212102230121) 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, 361948906 + ... + 361949491.

It is an arithmetic number, because the mean of its divisors is an integer number (53206532253).

Almost surely, 2^212102230321 is an apocalyptic number.

It is an amenable number.

212102230321 is a deficient number, since it is larger than the sum of its proper divisors (723898691).

212102230321 is an equidigital number, since it uses as much as digits as its factorization.

212102230321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723898690.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 212102230321 its reverse (123032201212), we get a palindrome (335134431533).

The spelling of 212102230321 in words is "two hundred twelve billion, one hundred two million, two hundred thirty thousand, three hundred twenty-one".