21312030211 has 8 divisors (see below), whose sum is σ = 21435153120. Its totient is φ = 21189038592.

The previous prime is 21312030199. The next prime is 21312030221. The reversal of 21312030211 is 11203021312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21312030211 - 2¹¹ = 21312028163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312030221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302610 + ... + 366328.

It is an arithmetic number, because the mean of its divisors is an integer number (2679394140).

Almost surely, 2^21312030211 is an apocalyptic number.

21312030211 is a deficient number, since it is larger than the sum of its proper divisors (123122909).

21312030211 is a wasteful number, since it uses less digits than its factorization.

21312030211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65645.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21312030211 its reverse (11203021312), we get a palindrome (32515051523).

The spelling of 21312030211 in words is "twenty-one billion, three hundred twelve million, thirty thousand, two hundred eleven".