21616243613503 has 24 divisors (see below), whose sum is σ = 27431714540880. Its totient is φ = 16843617141120.

The previous prime is 21616243613479. The next prime is 21616243613509. The reversal of 21616243613503 is 30531634261612.

It is a de Polignac number, because none of the positive numbers 2^k-21616243613503 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 21616243613503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616243613509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54301593 + ... + 54698221.

It is an arithmetic number, because the mean of its divisors is an integer number (1142988105870).

Almost surely, 2^{21616243613503} is an apocalyptic number.

21616243613503 is a deficient number, since it is larger than the sum of its proper divisors (5815470927377).

21616243613503 is a wasteful number, since it uses less digits than its factorization.

21616243613503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497767 (or 497760 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 21616243613503 in words is "twenty-one trillion, six hundred sixteen billion, two hundred forty-three million, six hundred thirteen thousand, five hundred three".