21130424223 has 4 divisors (see below), whose sum is σ = 28173898968. Its totient is φ = 14086949480.

The previous prime is 21130424209. The next prime is 21130424243. The reversal of 21130424223 is 32242403112.

It is a happy number.

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 21130424223 - 2²¹ = 21128327071 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21130424193 and 21130424202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130424243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3521737368 + ... + 3521737373.

It is an arithmetic number, because the mean of its divisors is an integer number (7043474742).

Almost surely, 2^21130424223 is an apocalyptic number.

21130424223 is a deficient number, since it is larger than the sum of its proper divisors (7043474745).

21130424223 is an equidigital number, since it uses as much as digits as its factorization.

21130424223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043474744.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21130424223 its reverse (32242403112), we get a palindrome (53372827335).

The spelling of 21130424223 in words is "twenty-one billion, one hundred thirty million, four hundred twenty-four thousand, two hundred twenty-three".