21503034210323 has 8 divisors (see below), whose sum is σ = 22259976508800. Its totient is φ = 20747122469248.

The previous prime is 21503034210241. The next prime is 21503034210337. The reversal of 21503034210323 is 32301243030512.

It is a happy number.

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 21503034210323 - 2¹⁰ = 21503034209299 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21503034219323) 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, 257596886 + ... + 257680347.

It is an arithmetic number, because the mean of its divisors is an integer number (2782497063600).

Almost surely, 2^{21503034210323} is an apocalyptic number.

21503034210323 is a deficient number, since it is larger than the sum of its proper divisors (756942298477).

21503034210323 is a wasteful number, since it uses less digits than its factorization.

21503034210323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515278701.

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 21503034210323 its reverse (32301243030512), we get a palindrome (53804277240835).

The spelling of 21503034210323 in words is "twenty-one trillion, five hundred three billion, thirty-four million, two hundred ten thousand, three hundred twenty-three".