21330232111 has 4 divisors (see below), whose sum is σ = 21403031832. Its totient is φ = 21257432392.

The previous prime is 21330232103. The next prime is 21330232123. The reversal of 21330232111 is 11123203312.

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 21330232111 - 2³ = 21330232103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330232151) 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, 36399421 + ... + 36400006.

It is an arithmetic number, because the mean of its divisors is an integer number (5350757958).

Almost surely, 2^21330232111 is an apocalyptic number.

21330232111 is a deficient number, since it is larger than the sum of its proper divisors (72799721).

21330232111 is an equidigital number, since it uses as much as digits as its factorization.

21330232111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72799720.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21330232111 its reverse (11123203312), we get a palindrome (32453435423).

The spelling of 21330232111 in words is "twenty-one billion, three hundred thirty million, two hundred thirty-two thousand, one hundred eleven".