21232323211 has 4 divisors (see below), whose sum is σ = 23162534424. Its totient is φ = 19302112000.

The previous prime is 21232323197. The next prime is 21232323223. The reversal of 21232323211 is 11232323212.

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 21232323211 - 2⁷ = 21232323083 is a prime.

It is a super-4 number, since 4×21232323211⁴ (a number of 42 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232323611) 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, 965105590 + ... + 965105611.

It is an arithmetic number, because the mean of its divisors is an integer number (5790633606).

Almost surely, 2^21232323211 is an apocalyptic number.

21232323211 is a deficient number, since it is larger than the sum of its proper divisors (1930211213).

21232323211 is a wasteful number, since it uses less digits than its factorization.

21232323211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930211212.

The product of its digits is 864, while the sum is 22.

Adding to 21232323211 its reverse (11232323212), we get a palindrome (32464646423).

Subtracting from 21232323211 its reverse (11232323212), we obtain a palindrome (9999999999).

It can be divided in two parts, 21232 and 323211, that added together give a palindrome (344443).

The spelling of 21232323211 in words is "twenty-one billion, two hundred thirty-two million, three hundred twenty-three thousand, two hundred eleven".