21033234523 has 8 divisors (see below), whose sum is σ = 24104943360. Its totient is φ = 17978265960.

The previous prime is 21033234487. The next prime is 21033234529. The reversal of 21033234523 is 32543233012.

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 21033234523 - 2¹⁷ = 21033103451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033234491 and 21033234500.

It is not an unprimeable number, because it can be changed into a prime (21033234529) 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, 4182373 + ... + 4187398.

It is an arithmetic number, because the mean of its divisors is an integer number (3013117920).

Almost surely, 2^21033234523 is an apocalyptic number.

21033234523 is a deficient number, since it is larger than the sum of its proper divisors (3071708837).

21033234523 is an equidigital number, since it uses as much as digits as its factorization.

21033234523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8370137.

The product of its (nonzero) digits is 12960, while the sum is 28.

Adding to 21033234523 its reverse (32543233012), we get a palindrome (53576467535).

The spelling of 21033234523 in words is "twenty-one billion, thirty-three million, two hundred thirty-four thousand, five hundred twenty-three".