1212012120161 has 2 divisors, whose sum is σ = 1212012120162. Its totient is φ = 1212012120160.

The previous prime is 1212012120139. The next prime is 1212012120203. The reversal of 1212012120161 is 1610212102121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1009534619536 + 202477500625 = 1004756^2 + 449975^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212012120161 - 2²⁶ = 1211945011297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212012128161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606006060080 + 606006060081.

It is an arithmetic number, because the mean of its divisors is an integer number (606006060081).

Almost surely, 2^{1212012120161} is an apocalyptic number.

It is an amenable number.

1212012120161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212012120161 is an equidigital number, since it uses as much as digits as its factorization.

1212012120161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1212012120161 its reverse (1610212102121), we get a palindrome (2822224222282).

The spelling of 1212012120161 in words is "one trillion, two hundred twelve billion, twelve million, one hundred twenty thousand, one hundred sixty-one".