20112103217 has 2 divisors, whose sum is σ = 20112103218. Its totient is φ = 20112103216.

The previous prime is 20112103211. The next prime is 20112103243. The reversal of 20112103217 is 71230121102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20106105616 + 5997601 = 141796^2 + 2449^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112103217 - 2⁸ = 20112102961 is a prime.

It is a super-2 number, since 2×20112103217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20112103211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056051608 + 10056051609.

It is an arithmetic number, because the mean of its divisors is an integer number (10056051609).

Almost surely, 2^20112103217 is an apocalyptic number.

It is an amenable number.

20112103217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112103217 is an equidigital number, since it uses as much as digits as its factorization.

20112103217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 20112103217 its reverse (71230121102), we get a palindrome (91342224319).

The spelling of 20112103217 in words is "twenty billion, one hundred twelve million, one hundred three thousand, two hundred seventeen".