21330210111 has 24 divisors (see below), whose sum is σ = 32739318144. Its totient is φ = 12100772880.

The previous prime is 21330210067. The next prime is 21330210119. The reversal of 21330210111 is 11101203312.

It is a happy number.

It is not a de Polignac number, because 21330210111 - 2⁶ = 21330210047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330210119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 379456 + ... + 432026.

It is an arithmetic number, because the mean of its divisors is an integer number (1364138256).

Almost surely, 2^21330210111 is an apocalyptic number.

21330210111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21330210111 is a deficient number, since it is larger than the sum of its proper divisors (11409108033).

21330210111 is an equidigital number, since it uses as much as digits as its factorization.

21330210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52859 (or 52720 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21330210111 its reverse (11101203312), we get a palindrome (32431413423).

The spelling of 21330210111 in words is "twenty-one billion, three hundred thirty million, two hundred ten thousand, one hundred eleven".