21322111 has 4 divisors (see below), whose sum is σ = 21343824. Its totient is φ = 21300400.

The previous prime is 21322099. The next prime is 21322117. The reversal of 21322111 is 11122312.

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 21322111 - 2⁷ = 21321983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21322091 and 21322100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9310 + ... + 11371.

It is an arithmetic number, because the mean of its divisors is an integer number (5335956).

Almost surely, 2^21322111 is an apocalyptic number.

21322111 is a deficient number, since it is larger than the sum of its proper divisors (21713).

21322111 is a wasteful number, since it uses less digits than its factorization.

21322111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21712.

The product of its digits is 24, while the sum is 13.

The square root of 21322111 is about 4617.5871404880. The cubic root of 21322111 is about 277.2958691393.

Adding to 21322111 its reverse (11122312), we get a palindrome (32444423).

The spelling of 21322111 in words is "twenty-one million, three hundred twenty-two thousand, one hundred eleven".