21616245235603 has 4 divisors (see below), whose sum is σ = 21616259813928. Its totient is φ = 21616230657280.

The previous prime is 21616245235589. The next prime is 21616245235633. The reversal of 21616245235603 is 30653254261612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21616245235603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21616245235633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4776238 + ... + 8126803.

It is an arithmetic number, because the mean of its divisors is an integer number (5404064953482).

Almost surely, 2^{21616245235603} is an apocalyptic number.

21616245235603 is a deficient number, since it is larger than the sum of its proper divisors (14578325).

21616245235603 is a wasteful number, since it uses less digits than its factorization.

21616245235603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14578324.

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 21616245235603 in words is "twenty-one trillion, six hundred sixteen billion, two hundred forty-five million, two hundred thirty-five thousand, six hundred three".