21738934565443 has 16 divisors (see below), whose sum is σ = 23331772316160. Its totient is φ = 20219938907616.

The previous prime is 21738934565437. The next prime is 21738934565507. The reversal of 21738934565443 is 34456543983712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21738934565443 is a prime.

It is a super-2 number, since 2×21738934565443² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21738934565423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145283653 + ... + 145433206.

It is an arithmetic number, because the mean of its divisors is an integer number (1458235769760).

Almost surely, 2^{21738934565443} is an apocalyptic number.

21738934565443 is a deficient number, since it is larger than the sum of its proper divisors (1592837750717).

21738934565443 is a wasteful number, since it uses less digits than its factorization.

21738934565443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290716986.

The product of its digits is 261273600, while the sum is 64.

The spelling of 21738934565443 in words is "twenty-one trillion, seven hundred thirty-eight billion, nine hundred thirty-four million, five hundred sixty-five thousand, four hundred forty-three".