1212424242121 has 4 divisors (see below), whose sum is σ = 1212501972244. Its totient is φ = 1212346512000.

The previous prime is 1212424242103. The next prime is 1212424242149.

1212424242121 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1006739316496 + 205684925625 = 1003364^2 + 453525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212424242121 - 2⁵ = 1212424242089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212424242121.

It is not an unprimeable number, because it can be changed into a prime (1212424245121) 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 in 3 ways as a sum of consecutive naturals, for example, 38841660 + ... + 38872861.

It is an arithmetic number, because the mean of its divisors is an integer number (303125493061).

Almost surely, 2^{1212424242121} is an apocalyptic number.

It is an amenable number.

1212424242121 is a deficient number, since it is larger than the sum of its proper divisors (77730123).

1212424242121 is an equidigital number, since it uses as much as digits as its factorization.

1212424242121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77730122.

The product of its digits is 4096, while the sum is 28.

The spelling of 1212424242121 in words is "one trillion, two hundred twelve billion, four hundred twenty-four million, two hundred forty-two thousand, one hundred twenty-one".