21112031223 has 12 divisors (see below), whose sum is σ = 31821032880. Its totient is φ = 13462744416.

The previous prime is 21112031219. The next prime is 21112031273. The reversal of 21112031223 is 32213021112.

21112031223 is a `hidden beast` number, since 211 + 120 + 312 + 23 = 666.

It is not a de Polignac number, because 21112031223 - 2² = 21112031219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112031196 and 21112031205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112031273) 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, 50995038 + ... + 50995451.

It is an arithmetic number, because the mean of its divisors is an integer number (2651752740).

Almost surely, 2^21112031223 is an apocalyptic number.

21112031223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21112031223 is a deficient number, since it is larger than the sum of its proper divisors (10709001657).

21112031223 is a wasteful number, since it uses less digits than its factorization.

21112031223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101990518 (or 101990515 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21112031223 its reverse (32213021112), we get a palindrome (53325052335).

The spelling of 21112031223 in words is "twenty-one billion, one hundred twelve million, thirty-one thousand, two hundred twenty-three".