121220200210121 has 2 divisors, whose sum is σ = 121220200210122. Its totient is φ = 121220200210120.

The previous prime is 121220200210091. The next prime is 121220200210157. The reversal of 121220200210121 is 121012002022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120731990571721 + 488209638400 = 10987811^2 + 698720^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220200210121 - 2³⁴ = 121203020340937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121220200210121.

It is not a weakly prime, because it can be changed into another prime (121220200218121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610100105060 + 60610100105061.

It is an arithmetic number, because the mean of its divisors is an integer number (60610100105061).

Almost surely, 2^{121220200210121} is an apocalyptic number.

It is an amenable number.

121220200210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220200210121 is an equidigital number, since it uses as much as digits as its factorization.

121220200210121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121220200210121 its reverse (121012002022121), we get a palindrome (242232202232242).

The spelling of 121220200210121 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred million, two hundred ten thousand, one hundred twenty-one".