21133310423 has 8 divisors (see below), whose sum is σ = 21268154880. Its totient is φ = 20998565080.

The previous prime is 21133310383. The next prime is 21133310459. The reversal of 21133310423 is 32401333112.

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 21133310423 - 2²⁸ = 20864874967 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 (21133310923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429398 + ... + 476076.

It is an arithmetic number, because the mean of its divisors is an integer number (2658519360).

Almost surely, 2^21133310423 is an apocalyptic number.

21133310423 is a deficient number, since it is larger than the sum of its proper divisors (134844457).

21133310423 is a wasteful number, since it uses less digits than its factorization.

21133310423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49557.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21133310423 its reverse (32401333112), we get a palindrome (53534643535).

The spelling of 21133310423 in words is "twenty-one billion, one hundred thirty-three million, three hundred ten thousand, four hundred twenty-three".