1212020020181 has 2 divisors, whose sum is σ = 1212020020182. Its totient is φ = 1212020020180.

The previous prime is 1212020020177. The next prime is 1212020020193. The reversal of 1212020020181 is 1810200202121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1029555208900 + 182464811281 = 1014670^2 + 427159^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212020020181 - 2² = 1212020020177 is a prime.

It is a super-2 number, since 2×1212020020181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212020020481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606010010090 + 606010010091.

It is an arithmetic number, because the mean of its divisors is an integer number (606010010091).

Almost surely, 2^{1212020020181} is an apocalyptic number.

It is an amenable number.

1212020020181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212020020181 is an equidigital number, since it uses as much as digits as its factorization.

1212020020181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

The spelling of 1212020020181 in words is "one trillion, two hundred twelve billion, twenty million, twenty thousand, one hundred eighty-one".