21354535404503 has 4 divisors (see below), whose sum is σ = 24405183319440. Its totient is φ = 18303887489568.

The previous prime is 21354535404493. The next prime is 21354535404529. The reversal of 21354535404503 is 30540453545312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21354535404503 - 2⁶ = 21354535404439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354535409503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1525323957458 + ... + 1525323957471.

It is an arithmetic number, because the mean of its divisors is an integer number (6101295829860).

Almost surely, 2^{21354535404503} is an apocalyptic number.

21354535404503 is a deficient number, since it is larger than the sum of its proper divisors (3050647914937).

21354535404503 is an equidigital number, since it uses as much as digits as its factorization.

21354535404503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3050647914936.

The product of its (nonzero) digits is 2160000, while the sum is 44.

Adding to 21354535404503 its reverse (30540453545312), we get a palindrome (51894988949815).

The spelling of 21354535404503 in words is "twenty-one trillion, three hundred fifty-four billion, five hundred thirty-five million, four hundred four thousand, five hundred three".