121221757 has 2 divisors, whose sum is σ = 121221758. Its totient is φ = 121221756.

The previous prime is 121221739. The next prime is 121221797. The reversal of 121221757 is 757122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91508356 + 29713401 = 9566^2 + 5451^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221757 - 2¹⁹ = 120697469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221797) 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, 60610878 + 60610879.

It is an arithmetic number, because the mean of its divisors is an integer number (60610879).

Almost surely, 2^121221757 is an apocalyptic number.

It is an amenable number.

121221757 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221757 is an equidigital number, since it uses as much as digits as its factorization.

121221757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1960, while the sum is 28.

The square root of 121221757 is about 11010.0752495158. The cubic root of 121221757 is about 494.9107168154.

Adding to 121221757 its reverse (757122121), we get a palindrome (878343878).

The spelling of 121221757 in words is "one hundred twenty-one million, two hundred twenty-one thousand, seven hundred fifty-seven".