20011121017 has 2 divisors, whose sum is σ = 20011121018. Its totient is φ = 20011121016.

The previous prime is 20011120999. The next prime is 20011121057. The reversal of 20011121017 is 71012111002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19020823056 + 990297961 = 137916^2 + 31469^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011121017 - 2⁷ = 20011120889 is a prime.

It is a super-2 number, since 2×20011121017² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20011121057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005560508 + 10005560509.

It is an arithmetic number, because the mean of its divisors is an integer number (10005560509).

Almost surely, 2^20011121017 is an apocalyptic number.

It is an amenable number.

20011121017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011121017 is an equidigital number, since it uses as much as digits as its factorization.

20011121017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 16.

Adding to 20011121017 its reverse (71012111002), we get a palindrome (91023232019).

The spelling of 20011121017 in words is "twenty billion, eleven million, one hundred twenty-one thousand, seventeen".