21223201111 has 4 divisors (see below), whose sum is σ = 24255086992. Its totient is φ = 18191315232.

The previous prime is 21223201049. The next prime is 21223201123. The reversal of 21223201111 is 11110232212.

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 21223201111 - 2²³ = 21214812503 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 (21223201141) 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, 1515942930 + ... + 1515942943.

It is an arithmetic number, because the mean of its divisors is an integer number (6063771748).

Almost surely, 2^21223201111 is an apocalyptic number.

21223201111 is a deficient number, since it is larger than the sum of its proper divisors (3031885881).

21223201111 is an equidigital number, since it uses as much as digits as its factorization.

21223201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031885880.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21223201111 its reverse (11110232212), we get a palindrome (32333433323).

The spelling of 21223201111 in words is "twenty-one billion, two hundred twenty-three million, two hundred one thousand, one hundred eleven".