1212122212121 has 8 divisors (see below), whose sum is σ = 1224248068488. Its totient is φ = 1199998800000.

The previous prime is 1212122212117. The next prime is 1212122212127.

1212122212121 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 694787264521 + 517334947600 = 833539^2 + 719260^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212122212121 - 2² = 1212122212117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212122212093 and 1212122212102.

It is not an unprimeable number, because it can be changed into a prime (1212122212127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393941 + ... + 1606061.

It is an arithmetic number, because the mean of its divisors is an integer number (153031008561).

Almost surely, 2^{1212122212121} is an apocalyptic number.

It is an amenable number.

1212122212121 is a deficient number, since it is larger than the sum of its proper divisors (12125856367).

1212122212121 is a wasteful number, since it uses less digits than its factorization.

1212122212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222123.

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

The spelling of 1212122212121 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".