212021230321 has 4 divisors (see below), whose sum is σ = 212032271092. Its totient is φ = 212010189552.

The previous prime is 212021230319. The next prime is 212021230331. The reversal of 212021230321 is 123032120212.

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 134862279696 + 77158950625 = 367236^2 + 277775^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021230321 - 2¹ = 212021230319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212021230331) 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, 5491530 + ... + 5530003.

It is an arithmetic number, because the mean of its divisors is an integer number (53008067773).

Almost surely, 2^212021230321 is an apocalyptic number.

It is an amenable number.

212021230321 is a deficient number, since it is larger than the sum of its proper divisors (11040771).

212021230321 is a wasteful number, since it uses less digits than its factorization.

212021230321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11040770.

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

Adding to 212021230321 its reverse (123032120212), we get a palindrome (335053350533).

The spelling of 212021230321 in words is "two hundred twelve billion, twenty-one million, two hundred thirty thousand, three hundred twenty-one".