21133421323 has 8 divisors (see below), whose sum is σ = 24253539840. Its totient is φ = 18038567400.

The previous prime is 21133421321. The next prime is 21133421357. The reversal of 21133421323 is 32312433112.

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

It is not a de Polignac number, because 21133421323 - 2¹ = 21133421321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133421321) 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, 6314353 + ... + 6317698.

It is an arithmetic number, because the mean of its divisors is an integer number (3031692480).

Almost surely, 2^21133421323 is an apocalyptic number.

21133421323 is a deficient number, since it is larger than the sum of its proper divisors (3120118517).

21133421323 is a wasteful number, since it uses less digits than its factorization.

21133421323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12632297.

The product of its digits is 2592, while the sum is 25.

Adding to 21133421323 its reverse (32312433112), we get a palindrome (53445854435).

The spelling of 21133421323 in words is "twenty-one billion, one hundred thirty-three million, four hundred twenty-one thousand, three hundred twenty-three".