1211200100012 has 36 divisors (see below), whose sum is σ = 2472163190280. Its totient is φ = 517716105984.

The previous prime is 1211200099997. The next prime is 1211200100023. The reversal of 1211200100012 is 2100010021121.

It is a junction number, because it is equal to n+sod(n) for n = 1211200099966 and 1211200100002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8078213 + ... + 8226780.

It is an arithmetic number, because the mean of its divisors is an integer number (68671199730).

Almost surely, 2^{1211200100012} is an apocalyptic number.

It is an amenable number.

1211200100012 is an abundant number, since it is smaller than the sum of its proper divisors (1260963090268).

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

1211200100012 is a wasteful number, since it uses less digits than its factorization.

1211200100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16305390 (or 16305381 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1211200100012 its reverse (2100010021121), we get a palindrome (3311210121133).

The spelling of 1211200100012 in words is "one trillion, two hundred eleven billion, two hundred million, one hundred thousand, twelve".