21533345522503 has 8 divisors (see below), whose sum is σ = 22828725507200. Its totient is φ = 20275512783840.

The previous prime is 21533345522471. The next prime is 21533345522561. The reversal of 21533345522503 is 30522554333512.

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 21533345522503 - 2⁵ = 21533345522471 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21533345522503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533343522503) 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, 9386810328 + ... + 9386812621.

It is an arithmetic number, because the mean of its divisors is an integer number (2853590688400).

Almost surely, 2^{21533345522503} is an apocalyptic number.

21533345522503 is a deficient number, since it is larger than the sum of its proper divisors (1295379984697).

21533345522503 is a wasteful number, since it uses less digits than its factorization.

21533345522503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18773623017.

The product of its (nonzero) digits is 1620000, while the sum is 43.

The spelling of 21533345522503 in words is "twenty-one trillion, five hundred thirty-three billion, three hundred forty-five million, five hundred twenty-two thousand, five hundred three".