21813467123 has 16 divisors (see below), whose sum is σ = 26573952000. Its totient is φ = 17488965312.

The previous prime is 21813467111. The next prime is 21813467147. The reversal of 21813467123 is 32176431812.

It is not a de Polignac number, because 21813467123 - 2⁸ = 21813466867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21813467723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1027538 + ... + 1048551.

It is an arithmetic number, because the mean of its divisors is an integer number (1660872000).

Almost surely, 2^21813467123 is an apocalyptic number.

21813467123 is a deficient number, since it is larger than the sum of its proper divisors (4760484877).

21813467123 is a wasteful number, since it uses less digits than its factorization.

21813467123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076194.

The product of its digits is 48384, while the sum is 38.

Adding to 21813467123 its reverse (32176431812), we get a palindrome (53989898935).

The spelling of 21813467123 in words is "twenty-one billion, eight hundred thirteen million, four hundred sixty-seven thousand, one hundred twenty-three".