21211112223 has 40 divisors (see below), whose sum is σ = 36230536320. Its totient is φ = 12114522000.

The previous prime is 21211112207. The next prime is 21211112231. The reversal of 21211112223 is 32221111212.

It is not a de Polignac number, because 21211112223 - 2⁴ = 21211112207 is a prime.

It is a super-2 number, since 2×21211112223² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211112196 and 21211112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211112723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1268008 + ... + 1284626.

It is an arithmetic number, because the mean of its divisors is an integer number (905763408).

Almost surely, 2^21211112223 is an apocalyptic number.

21211112223 is a deficient number, since it is larger than the sum of its proper divisors (15019424097).

21211112223 is a wasteful number, since it uses less digits than its factorization.

21211112223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18889 (or 18880 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 21211112223 its reverse (32221111212), we get a palindrome (53432223435).

The spelling of 21211112223 in words is "twenty-one billion, two hundred eleven million, one hundred twelve thousand, two hundred twenty-three".