21111101223 has 16 divisors (see below), whose sum is σ = 28276407936. Its totient is φ = 14009996000.

The previous prime is 21111101213. The next prime is 21111101239. The reversal of 21111101223 is 32210111112.

It is a cyclic number.

It is not a de Polignac number, because 21111101223 - 2¹² = 21111097127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111101213) 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 15 ways as a sum of consecutive naturals, for example, 1501261 + ... + 1515257.

It is an arithmetic number, because the mean of its divisors is an integer number (1767275496).

Almost surely, 2^21111101223 is an apocalyptic number.

21111101223 is a deficient number, since it is larger than the sum of its proper divisors (7165306713).

21111101223 is a wasteful number, since it uses less digits than its factorization.

21111101223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16254.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21111101223 its reverse (32210111112), we get a palindrome (53321212335).

The spelling of 21111101223 in words is "twenty-one billion, one hundred eleven million, one hundred one thousand, two hundred twenty-three".