1212122202121 has 4 divisors (see below), whose sum is σ = 1212125260612. Its totient is φ = 1212119143632.

The previous prime is 1212122202073. The next prime is 1212122202139. The reversal of 1212122202121 is 1212022212121.

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 344968275600 + 867153926521 = 587340^2 + 931211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212122202121 - 2¹³ = 1212122193929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212122502121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 827406 + ... + 1763191.

It is an arithmetic number, because the mean of its divisors is an integer number (303031315153).

Almost surely, 2^{1212122202121} is an apocalyptic number.

It is an amenable number.

1212122202121 is a deficient number, since it is larger than the sum of its proper divisors (3058491).

1212122202121 is an equidigital number, since it uses as much as digits as its factorization.

1212122202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3058490.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1212122202121 its reverse (1212022212121), we get a palindrome (2424144414242).

The spelling of 1212122202121 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred two thousand, one hundred twenty-one".