21242312111223 has 12 divisors (see below), whose sum is σ = 35066673961488. Its totient is φ = 12138464063520.

The previous prime is 21242312111221. The next prime is 21242312111257. The reversal of 21242312111223 is 32211121324212.

21242312111223 is a `hidden beast` number, since 2 + 1 + 2 + 423 + 1 + 2 + 1 + 11 + 223 = 666.

It is not a de Polignac number, because 21242312111223 - 2¹ = 21242312111221 is a prime.

It is a super-2 number, since 2×21242312111223² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242312111221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168589778598 + ... + 168589778723.

It is an arithmetic number, because the mean of its divisors is an integer number (2922222830124).

Almost surely, 2^{21242312111223} is an apocalyptic number.

21242312111223 is a deficient number, since it is larger than the sum of its proper divisors (13824361850265).

21242312111223 is a wasteful number, since it uses less digits than its factorization.

21242312111223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337179557334 (or 337179557331 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

Adding to 21242312111223 its reverse (32211121324212), we get a palindrome (53453433435435).

The spelling of 21242312111223 in words is "twenty-one trillion, two hundred forty-two billion, three hundred twelve million, one hundred eleven thousand, two hundred twenty-three".