1212110121281 has 2 divisors, whose sum is σ = 1212110121282. Its totient is φ = 1212110121280.

The previous prime is 1212110121251. The next prime is 1212110121323. The reversal of 1212110121281 is 1821210112121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 928110658225 + 283999463056 = 963385^2 + 532916^2 .

It is an emirp because it is prime and its reverse (1821210112121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212110121281 - 2³⁴ = 1194930252097 is a prime.

It is a super-2 number, since 2×1212110121281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1212110121251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606055060640 + 606055060641.

It is an arithmetic number, because the mean of its divisors is an integer number (606055060641).

Almost surely, 2^{1212110121281} is an apocalyptic number.

It is an amenable number.

1212110121281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212110121281 is an equidigital number, since it uses as much as digits as its factorization.

1212110121281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 23.

The spelling of 1212110121281 in words is "one trillion, two hundred twelve billion, one hundred ten million, one hundred twenty-one thousand, two hundred eighty-one".