121020111217 has 2 divisors, whose sum is σ = 121020111218. Its totient is φ = 121020111216.

The previous prime is 121020111209. The next prime is 121020111257. The reversal of 121020111217 is 712111020121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103170082401 + 17850028816 = 321201^2 + 133604^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020111217 - 2³ = 121020111209 is a prime.

It is a super-3 number, since 3×121020111217³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121020111194 and 121020111203.

It is not a weakly prime, because it can be changed into another prime (121020111257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510055608 + 60510055609.

It is an arithmetic number, because the mean of its divisors is an integer number (60510055609).

Almost surely, 2^121020111217 is an apocalyptic number.

It is an amenable number.

121020111217 is a deficient number, since it is larger than the sum of its proper divisors (1).

121020111217 is an equidigital number, since it uses as much as digits as its factorization.

121020111217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 121020111217 its reverse (712111020121), we get a palindrome (833131131338).

The spelling of 121020111217 in words is "one hundred twenty-one billion, twenty million, one hundred eleven thousand, two hundred seventeen".