21113133223 has 16 divisors (see below), whose sum is σ = 26242687296. Its totient is φ = 16539494400.

The previous prime is 21113133211. The next prime is 21113133277. The reversal of 21113133223 is 32233131112.

It is a de Polignac number, because none of the positive numbers 2^k-21113133223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21113133194 and 21113133203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113131223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1139386 + ... + 1157767.

It is an arithmetic number, because the mean of its divisors is an integer number (1640167956).

Almost surely, 2^21113133223 is an apocalyptic number.

21113133223 is a deficient number, since it is larger than the sum of its proper divisors (5129554073).

21113133223 is a wasteful number, since it uses less digits than its factorization.

21113133223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297274.

The product of its digits is 648, while the sum is 22.

Adding to 21113133223 its reverse (32233131112), we get a palindrome (53346264335).

The spelling of 21113133223 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-three thousand, two hundred twenty-three".