21438718068081 has 8 divisors (see below), whose sum is σ = 28584979273600. Its totient is φ = 14292467787312.

The previous prime is 21438718068043. The next prime is 21438718068133. The reversal of 21438718068081 is 18086081783412.

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

It is not a de Polignac number, because 21438718068081 - 2⁶ = 21438718068017 is a prime.

It is a super-2 number, since 2×21438718068081² (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 (21438718068881) 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, 4869411 + ... + 8160183.

It is an arithmetic number, because the mean of its divisors is an integer number (3573122409200).

Almost surely, 2^{21438718068081} is an apocalyptic number.

It is an amenable number.

21438718068081 is a deficient number, since it is larger than the sum of its proper divisors (7146261205519).

21438718068081 is a wasteful number, since it uses less digits than its factorization.

21438718068081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5462375.

The product of its (nonzero) digits is 4128768, while the sum is 57.

The spelling of 21438718068081 in words is "twenty-one trillion, four hundred thirty-eight billion, seven hundred eighteen million, sixty-eight thousand, eighty-one".