21130031423 has 6 divisors (see below), whose sum is σ = 22300670664. Its totient is φ = 20017924164.

The previous prime is 21130031413. The next prime is 21130031473. The reversal of 21130031423 is 32413003112.

It is not a de Polignac number, because 21130031423 - 2⁴ = 21130031407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21130031395 and 21130031404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130031413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29265611 + ... + 29266332.

It is an arithmetic number, because the mean of its divisors is an integer number (3716778444).

Almost surely, 2^21130031423 is an apocalyptic number.

21130031423 is a deficient number, since it is larger than the sum of its proper divisors (1170639241).

21130031423 is an equidigital number, since it uses as much as digits as its factorization.

21130031423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58531981 (or 58531962 counting only the distinct ones).

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

Adding to 21130031423 its reverse (32413003112), we get a palindrome (53543034535).

The spelling of 21130031423 in words is "twenty-one billion, one hundred thirty million, thirty-one thousand, four hundred twenty-three".