21103231223 has 4 divisors (see below), whose sum is σ = 21108393768. Its totient is φ = 21098068680.

The previous prime is 21103231199. The next prime is 21103231229. The reversal of 21103231223 is 32213230112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21103231223 - 2⁶ = 21103231159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103231195 and 21103231204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103231229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2575136 + ... + 2583317.

It is an arithmetic number, because the mean of its divisors is an integer number (5277098442).

Almost surely, 2^21103231223 is an apocalyptic number.

21103231223 is a deficient number, since it is larger than the sum of its proper divisors (5162545).

21103231223 is an equidigital number, since it uses as much as digits as its factorization.

21103231223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5162544.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21103231223 its reverse (32213230112), we get a palindrome (53316461335).

The spelling of 21103231223 in words is "twenty-one billion, one hundred three million, two hundred thirty-one thousand, two hundred twenty-three".