1212000001988 has 12 divisors (see below), whose sum is σ = 2245764709692. Its totient is φ = 570352942080.

The previous prime is 1212000001921. The next prime is 1212000002041. The reversal of 1212000001988 is 8891000002121.

It can be written as a sum of positive squares in 2 ways, for example, as 965420223364 + 246579778624 = 982558^2 + 496568^2 .

It is an unprimeable number.

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, 8911764653 + ... + 8911764788.

It is an arithmetic number, because the mean of its divisors is an integer number (187147059141).

Almost surely, 2^{1212000001988} is an apocalyptic number.

It is an amenable number.

1212000001988 is a deficient number, since it is larger than the sum of its proper divisors (1033764707704).

1212000001988 is a wasteful number, since it uses less digits than its factorization.

1212000001988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17823529462 (or 17823529460 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 32.

The spelling of 1212000001988 in words is "one trillion, two hundred twelve billion, one thousand, nine hundred eighty-eight".