21660536524603 has 8 divisors (see below), whose sum is σ = 22966992245520. Its totient is φ = 20370723552000.

The previous prime is 21660536524589. The next prime is 21660536524619. The reversal of 21660536524603 is 30642563506612.

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 21660536524603 - 2²¹ = 21660534427451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21660536524643) 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, 4160684398 + ... + 4160689603.

It is an arithmetic number, because the mean of its divisors is an integer number (2870874030690).

Almost surely, 2^{21660536524603} is an apocalyptic number.

21660536524603 is a deficient number, since it is larger than the sum of its proper divisors (1306455720917).

21660536524603 is a wasteful number, since it uses less digits than its factorization.

21660536524603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8321374157.

The product of its (nonzero) digits is 4665600, while the sum is 49.

Subtracting 21660536524603 from its reverse (30642563506612), we obtain a square (8982026982009 = 2997003²).

The spelling of 21660536524603 in words is "twenty-one trillion, six hundred sixty billion, five hundred thirty-six million, five hundred twenty-four thousand, six hundred three".