21232321111 has 8 divisors (see below), whose sum is σ = 21875972544. Its totient is φ = 20596665600.

The previous prime is 21232321093. The next prime is 21232321141. The reversal of 21232321111 is 11112323212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21232321111 - 2⁵ = 21232321079 is a prime.

It is a super-2 number, since 2×21232321111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232321141) 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 7 ways as a sum of consecutive naturals, for example, 1993590 + ... + 2004211.

It is an arithmetic number, because the mean of its divisors is an integer number (2734496568).

Almost surely, 2^21232321111 is an apocalyptic number.

21232321111 is a deficient number, since it is larger than the sum of its proper divisors (643651433).

21232321111 is a wasteful number, since it uses less digits than its factorization.

21232321111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997961.

The product of its digits is 144, while the sum is 19.

Adding to 21232321111 its reverse (11112323212), we get a palindrome (32344644323).

The spelling of 21232321111 in words is "twenty-one billion, two hundred thirty-two million, three hundred twenty-one thousand, one hundred eleven".