121221011210281 has 2 divisors, whose sum is σ = 121221011210282. Its totient is φ = 121221011210280.

The previous prime is 121221011210239. The next prime is 121221011210293. The reversal of 121221011210281 is 182012110122121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69057097203600 + 52163914006681 = 8310060^2 + 7222459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221011210281 is a prime.

It is a super-2 number, since 2×121221011210281² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121221011210681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610505605140 + 60610505605141.

It is an arithmetic number, because the mean of its divisors is an integer number (60610505605141).

Almost surely, 2^{121221011210281} is an apocalyptic number.

It is an amenable number.

121221011210281 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221011210281 is an equidigital number, since it uses as much as digits as its factorization.

121221011210281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 25.

The spelling of 121221011210281 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, eleven million, two hundred ten thousand, two hundred eighty-one".