21231230211 has 48 divisors (see below), whose sum is σ = 32821152000. Its totient is φ = 13185716544.

The previous prime is 21231230101. The next prime is 21231230213. The reversal of 21231230211 is 11203213212.

It is not a de Polignac number, because 21231230211 - 2¹¹ = 21231228163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21231230213) 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 47 ways as a sum of consecutive naturals, for example, 8327965 + ... + 8330513.

It is an arithmetic number, because the mean of its divisors is an integer number (683774000).

Almost surely, 2^21231230211 is an apocalyptic number.

21231230211 is a deficient number, since it is larger than the sum of its proper divisors (11589921789).

21231230211 is a wasteful number, since it uses less digits than its factorization.

21231230211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368 (or 3365 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21231230211 its reverse (11203213212), we get a palindrome (32434443423).

The spelling of 21231230211 in words is "twenty-one billion, two hundred thirty-one million, two hundred thirty thousand, two hundred eleven".