121220117 has 2 divisors, whose sum is σ = 121220118. Its totient is φ = 121220116.

The previous prime is 121220107. The next prime is 121220147. The reversal of 121220117 is 711022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67256401 + 53963716 = 8201^2 + 7346^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220117 - 2⁴ = 121220101 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121220095 and 121220104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121220107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610058 + 60610059.

It is an arithmetic number, because the mean of its divisors is an integer number (60610059).

Almost surely, 2^121220117 is an apocalyptic number.

It is an amenable number.

121220117 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220117 is an equidigital number, since it uses as much as digits as its factorization.

121220117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 121220117 is about 11010.0007720254. Note that the first 3 decimals coincide. The cubic root of 121220117 is about 494.9084849354.

Subtracting from 121220117 its sum of digits (17), we obtain a square (121220100 = 11010²).

Adding to 121220117 its reverse (711022121), we get a palindrome (832242238).

The spelling of 121220117 in words is "one hundred twenty-one million, two hundred twenty thousand, one hundred seventeen".