21131134423 has 8 divisors (see below), whose sum is σ = 24440830848. Its totient is φ = 17894178744.

The previous prime is 21131134421. The next prime is 21131134429. The reversal of 21131134423 is 32443113112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21131134423 - 2¹ = 21131134421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131134421) 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 7 ways as a sum of consecutive naturals, for example, 18184561 + ... + 18185722.

It is an arithmetic number, because the mean of its divisors is an integer number (3055103856).

Almost surely, 2^21131134423 is an apocalyptic number.

21131134423 is a deficient number, since it is larger than the sum of its proper divisors (3309696425).

21131134423 is an equidigital number, since it uses as much as digits as its factorization.

21131134423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36370373.

The product of its digits is 1728, while the sum is 25.

Adding to 21131134423 its reverse (32443113112), we get a palindrome (53574247535).

The spelling of 21131134423 in words is "twenty-one billion, one hundred thirty-one million, one hundred thirty-four thousand, four hundred twenty-three".