21233122111 has 4 divisors (see below), whose sum is σ = 22482129312. Its totient is φ = 19984114912.

The previous prime is 21233122103. The next prime is 21233122121. The reversal of 21233122111 is 11122133212.

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 21233122111 - 2³ = 21233122103 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 (21233122121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624503575 + ... + 624503608.

It is an arithmetic number, because the mean of its divisors is an integer number (5620532328).

Almost surely, 2^21233122111 is an apocalyptic number.

21233122111 is a deficient number, since it is larger than the sum of its proper divisors (1249007201).

21233122111 is a wasteful number, since it uses less digits than its factorization.

21233122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249007200.

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

Adding to 21233122111 its reverse (11122133212), we get a palindrome (32355255323).

The spelling of 21233122111 in words is "twenty-one billion, two hundred thirty-three million, one hundred twenty-two thousand, one hundred eleven".