21616423516443 has 8 divisors (see below), whose sum is σ = 32939312025088. Its totient is φ = 12352242009384.

The previous prime is 21616423516427. The next prime is 21616423516489. The reversal of 21616423516443 is 34461532461612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21616423516443 - 2⁴ = 21616423516427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21616423516392 and 21616423516401.

It is not an unprimeable number, because it can be changed into a prime (21616423516423) 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, 514676750371 + ... + 514676750412.

It is an arithmetic number, because the mean of its divisors is an integer number (4117414003136).

Almost surely, 2^{21616423516443} is an apocalyptic number.

21616423516443 is a deficient number, since it is larger than the sum of its proper divisors (11322888508645).

21616423516443 is a wasteful number, since it uses less digits than its factorization.

21616423516443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029353500793.

The product of its digits is 2488320, while the sum is 48.

The spelling of 21616423516443 in words is "twenty-one trillion, six hundred sixteen billion, four hundred twenty-three million, five hundred sixteen thousand, four hundred forty-three".