21330233211 has 16 divisors (see below), whose sum is σ = 32506601984. Its totient is φ = 12187433664.

The previous prime is 21330233201. The next prime is 21330233237. The reversal of 21330233211 is 11233203312.

It is not a de Polignac number, because 21330233211 - 2²³ = 21321844603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21330233201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176295 + ... + 271551.

It is an arithmetic number, because the mean of its divisors is an integer number (2031662624).

Almost surely, 2^21330233211 is an apocalyptic number.

21330233211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21330233211 is a deficient number, since it is larger than the sum of its proper divisors (11176368773).

21330233211 is a wasteful number, since it uses less digits than its factorization.

21330233211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105930.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21330233211 its reverse (11233203312), we get a palindrome (32563436523).

It can be divided in two parts, 21330 and 233211, that added together give a triangular number (254541 = T₇₁₃).

The spelling of 21330233211 in words is "twenty-one billion, three hundred thirty million, two hundred thirty-three thousand, two hundred eleven".