21113312223 has 32 divisors (see below), whose sum is σ = 29679952896. Its totient is φ = 13336178688.

The previous prime is 21113312179. The next prime is 21113312281. The reversal of 21113312223 is 32221331112.

It is not a de Polignac number, because 21113312223 - 2¹⁰ = 21113311199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21113312223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113311223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 669711 + ... + 700527.

It is an arithmetic number, because the mean of its divisors is an integer number (927498528).

Almost surely, 2^21113312223 is an apocalyptic number.

21113312223 is a deficient number, since it is larger than the sum of its proper divisors (8566640673).

21113312223 is a wasteful number, since it uses less digits than its factorization.

21113312223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31023.

The product of its digits is 432, while the sum is 21.

Adding to 21113312223 its reverse (32221331112), we get a palindrome (53334643335).

It can be divided in two parts, 21113 and 312223, that added together give a triangular number (333336 = T₈₁₆).

The spelling of 21113312223 in words is "twenty-one billion, one hundred thirteen million, three hundred twelve thousand, two hundred twenty-three".