21500069086081 has 8 divisors (see below), whose sum is σ = 21562718367464. Its totient is φ = 21437487941760.

The previous prime is 21500069086033. The next prime is 21500069086099. The reversal of 21500069086081 is 18068096000512.

It can be written as a sum of positive squares in 4 ways, for example, as 8315610342400 + 13184458743681 = 2883680^2 + 3631041^2 .

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 21500069086081 - 2¹⁷ = 21500068955009 is a prime.

It is a super-2 number, since 2×21500069086081² (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 (21500069086031) 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, 16402230 + ... + 17664463.

It is an arithmetic number, because the mean of its divisors is an integer number (2695339795933).

Almost surely, 2^{21500069086081} is an apocalyptic number.

It is an amenable number.

21500069086081 is a deficient number, since it is larger than the sum of its proper divisors (62649281383).

21500069086081 is a wasteful number, since it uses less digits than its factorization.

21500069086081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34068531.

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 21500069086081 in words is "twenty-one trillion, five hundred billion, sixty-nine million, eighty-six thousand, eighty-one".