1212122121401 has 2 divisors, whose sum is σ = 1212122121402. Its totient is φ = 1212122121400.

The previous prime is 1212122121323. The next prime is 1212122121409. The reversal of 1212122121401 is 1041212212121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 942600207376 + 269521914025 = 970876^2 + 519155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212122121401 - 2¹⁴ = 1212122105017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1212122121409) 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, 606061060700 + 606061060701.

It is an arithmetic number, because the mean of its divisors is an integer number (606061060701).

Almost surely, 2^{1212122121401} is an apocalyptic number.

It is an amenable number.

1212122121401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212122121401 is an equidigital number, since it uses as much as digits as its factorization.

1212122121401 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.

Adding to 1212122121401 its reverse (1041212212121), we get a palindrome (2253334333522).

The spelling of 1212122121401 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, one hundred twenty-one thousand, four hundred one".