121220101 has 2 divisors, whose sum is σ = 121220102. Its totient is φ = 121220100.

The previous prime is 121220069. The next prime is 121220107. The reversal of 121220101 is 101022121.

It is a Cunningham number, because it is equal to 11010²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121220100 + 1 = 11010^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220101 - 2⁵ = 121220069 is a prime.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610050 + 60610051.

It is an arithmetic number, because the mean of its divisors is an integer number (60610051).

Almost surely, 2^121220101 is an apocalyptic number.

It is an amenable number.

121220101 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220101 is an equidigital number, since it uses as much as digits as its factorization.

121220101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 121220101 is about 11010.0000454133. Note that the first 4 decimals coincide. The cubic root of 121220101 is about 494.9084631609.

Adding to 121220101 its reverse (101022121), we get a palindrome (222242222).

The spelling of 121220101 in words is "one hundred twenty-one million, two hundred twenty thousand, one hundred one".