21738934565441 has 8 divisors (see below), whose sum is σ = 21751109392320. Its totient is φ = 21726760180528.

The previous prime is 21738934565437. The next prime is 21738934565507. The reversal of 21738934565441 is 14456543983712.

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 21738934565441 - 2² = 21738934565437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21738934565431) 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, 173978510 + ... + 174103416.

It is an arithmetic number, because the mean of its divisors is an integer number (2718888674040).

Almost surely, 2^{21738934565441} is an apocalyptic number.

It is an amenable number.

21738934565441 is a deficient number, since it is larger than the sum of its proper divisors (12174826879).

21738934565441 is a wasteful number, since it uses less digits than its factorization.

21738934565441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220983.

The product of its digits is 87091200, while the sum is 62.

The spelling of 21738934565441 in words is "twenty-one trillion, seven hundred thirty-eight billion, nine hundred thirty-four million, five hundred sixty-five thousand, four hundred forty-one".