20216135081017 has 4 divisors (see below), whose sum is σ = 20351813840100. Its totient is φ = 20080456321936.

The previous prime is 20216135080997. The next prime is 20216135081101. The reversal of 20216135081017 is 71018053161202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3534922659321 + 16681212421696 = 1880139^2 + 4084264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20216135081017 is a prime.

It is a super-2 number, since 2×20216135081017² (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 (20216135081117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67839379318 + ... + 67839379615.

It is an arithmetic number, because the mean of its divisors is an integer number (5087953460025).

Almost surely, 2^{20216135081017} is an apocalyptic number.

It is an amenable number.

20216135081017 is a deficient number, since it is larger than the sum of its proper divisors (135678759083).

20216135081017 is a wasteful number, since it uses less digits than its factorization.

20216135081017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135678759082.

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 20216135081017 in words is "twenty trillion, two hundred sixteen billion, one hundred thirty-five million, eighty-one thousand, seventeen".