21101233211 has 4 divisors (see below), whose sum is σ = 21101718624. Its totient is φ = 21100747800.

The previous prime is 21101233189. The next prime is 21101233213. The reversal of 21101233211 is 11233210112.

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 21101233211 - 2⁶ = 21101233147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101233211.

It is not an unprimeable number, because it can be changed into a prime (21101233213) 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 3 ways as a sum of consecutive naturals, for example, 170300 + ... + 266841.

It is an arithmetic number, because the mean of its divisors is an integer number (5275429656).

Almost surely, 2^21101233211 is an apocalyptic number.

21101233211 is a deficient number, since it is larger than the sum of its proper divisors (485413).

21101233211 is an equidigital number, since it uses as much as digits as its factorization.

21101233211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485412.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21101233211 its reverse (11233210112), we get a palindrome (32334443323).

It can be divided in two parts, 2110 and 1233211, that added together give a palindrome (1235321).

The spelling of 21101233211 in words is "twenty-one billion, one hundred one million, two hundred thirty-three thousand, two hundred eleven".