121221100331281 has 2 divisors, whose sum is σ = 121221100331282. Its totient is φ = 121221100331280.

The previous prime is 121221100331267. The next prime is 121221100331321. The reversal of 121221100331281 is 182133001122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114620234615056 + 6600865716225 = 10706084^2 + 2569215^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221100331281 - 2¹¹ = 121221100329233 is a prime.

It is a super-2 number, since 2×121221100331281² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121221100331251) 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, 60610550165640 + 60610550165641.

It is an arithmetic number, because the mean of its divisors is an integer number (60610550165641).

Almost surely, 2^{121221100331281} is an apocalyptic number.

It is an amenable number.

121221100331281 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221100331281 is an equidigital number, since it uses as much as digits as its factorization.

121221100331281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 121221100331281 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred million, three hundred thirty-one thousand, two hundred eighty-one".