21311134221423 has 16 divisors (see below), whose sum is σ = 29217026533856. Its totient is φ = 13807232680320.

The previous prime is 21311134221409. The next prime is 21311134221451. The reversal of 21311134221423 is 32412243111312.

It is not a de Polignac number, because 21311134221423 - 2¹³ = 21311134213231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311134221023) 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 15 ways as a sum of consecutive naturals, for example, 112444708 + ... + 112634073.

It is an arithmetic number, because the mean of its divisors is an integer number (1826064158366).

Almost surely, 2^{21311134221423} is an apocalyptic number.

21311134221423 is a deficient number, since it is larger than the sum of its proper divisors (7905892312433).

21311134221423 is a wasteful number, since it uses less digits than its factorization.

21311134221423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225079674.

The product of its digits is 6912, while the sum is 30.

Adding to 21311134221423 its reverse (32412243111312), we get a palindrome (53723377332735).

It can be divided in two parts, 2131113 and 4221423, that added together give a palindrome (6352536).

The spelling of 21311134221423 in words is "twenty-one trillion, three hundred eleven billion, one hundred thirty-four million, two hundred twenty-one thousand, four hundred twenty-three".