21232230211 has 4 divisors (see below), whose sum is σ = 21237130152. Its totient is φ = 21227330272.

The previous prime is 21232230209. The next prime is 21232230251. The reversal of 21232230211 is 11203223212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21232230211 - 2¹ = 21232230209 is a prime.

It is a super-2 number, since 2×21232230211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232230251) 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 3 ways as a sum of consecutive naturals, for example, 2443465 + ... + 2452138.

It is an arithmetic number, because the mean of its divisors is an integer number (5309282538).

Almost surely, 2^21232230211 is an apocalyptic number.

21232230211 is a deficient number, since it is larger than the sum of its proper divisors (4899941).

21232230211 is an equidigital number, since it uses as much as digits as its factorization.

21232230211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4899940.

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

Adding to 21232230211 its reverse (11203223212), we get a palindrome (32435453423).

The spelling of 21232230211 in words is "twenty-one billion, two hundred thirty-two million, two hundred thirty thousand, two hundred eleven".