20112221017 has 16 divisors (see below), whose sum is σ = 23751498112. Its totient is φ = 16670188800.

The previous prime is 20112221011. The next prime is 20112221099. The reversal of 20112221017 is 71012221102.

It is a cyclic number.

It is not a de Polignac number, because 20112221017 - 2¹⁹ = 20111696729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112220985 and 20112221003.

It is not an unprimeable number, because it can be changed into a prime (20112221011) 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, 195984 + ... + 280417.

It is an arithmetic number, because the mean of its divisors is an integer number (1484468632).

Almost surely, 2^20112221017 is an apocalyptic number.

It is an amenable number.

20112221017 is a deficient number, since it is larger than the sum of its proper divisors (3639277095).

20112221017 is a wasteful number, since it uses less digits than its factorization.

20112221017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476608.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 20112221017 its reverse (71012221102), we get a palindrome (91124442119).

The spelling of 20112221017 in words is "twenty billion, one hundred twelve million, two hundred twenty-one thousand, seventeen".