121210657 has 2 divisors, whose sum is σ = 121210658. Its totient is φ = 121210656.

The previous prime is 121210619. The next prime is 121210673. The reversal of 121210657 is 756012121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118897216 + 2313441 = 10904^2 + 1521^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210657 - 2¹¹ = 121208609 is a prime.

It is not a weakly prime, because it can be changed into another prime (121210157) 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, 60605328 + 60605329.

It is an arithmetic number, because the mean of its divisors is an integer number (60605329).

Almost surely, 2^121210657 is an apocalyptic number.

It is an amenable number.

121210657 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210657 is an equidigital number, since it uses as much as digits as its factorization.

121210657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 121210657 is about 11009.5711542276. The cubic root of 121210657 is about 494.8956104055.

Adding to 121210657 its reverse (756012121), we get a palindrome (877222778).

The spelling of 121210657 in words is "one hundred twenty-one million, two hundred ten thousand, six hundred fifty-seven".