1212210121266 has 32 divisors (see below), whose sum is σ = 2693986041600. Its totient is φ = 404042174640.

The previous prime is 1212210121183. The next prime is 1212210121267. The reversal of 1212210121266 is 6621210122121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1212210121267) 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 15 ways as a sum of consecutive naturals, for example, 23776 + ... + 1557236.

It is an arithmetic number, because the mean of its divisors is an integer number (84187063800).

Almost surely, 2^{1212210121266} is an apocalyptic number.

1212210121266 is an abundant number, since it is smaller than the sum of its proper divisors (1481775920334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212210121266 is a wasteful number, since it uses less digits than its factorization.

1212210121266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548111 (or 1548105 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

Adding to 1212210121266 its reverse (6621210122121), we get a palindrome (7833420243387).

The spelling of 1212210121266 in words is "one trillion, two hundred twelve billion, two hundred ten million, one hundred twenty-one thousand, two hundred sixty-six".