20122120217 has 2 divisors, whose sum is σ = 20122120218. Its totient is φ = 20122120216.

The previous prime is 20122120129. The next prime is 20122120307. The reversal of 20122120217 is 71202122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19814503696 + 307616521 = 140764^2 + 17539^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122120217 - 2⁸ = 20122119961 is a prime.

It is not a weakly prime, because it can be changed into another prime (20122129217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061060108 + 10061060109.

It is an arithmetic number, because the mean of its divisors is an integer number (10061060109).

Almost surely, 2^20122120217 is an apocalyptic number.

It is an amenable number.

20122120217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122120217 is an equidigital number, since it uses as much as digits as its factorization.

20122120217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 20122120217 its reverse (71202122102), we get a palindrome (91324242319).

The spelling of 20122120217 in words is "twenty billion, one hundred twenty-two million, one hundred twenty thousand, two hundred seventeen".