1211100111012 has 48 divisors (see below), whose sum is σ = 3083360716800. Its totient is φ = 366933315360.

The previous prime is 1211100111007. The next prime is 1211100111047. The reversal of 1211100111012 is 2101110011121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102712 + ... + 1559727.

It is an arithmetic number, because the mean of its divisors is an integer number (64236681600).

Almost surely, 2^{1211100111012} is an apocalyptic number.

1211100111012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211100111012 is an abundant number, since it is smaller than the sum of its proper divisors (1872260605788).

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

1211100111012 is a wasteful number, since it uses less digits than its factorization.

1211100111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667976 (or 1667974 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1211100111012 its reverse (2101110011121), we get a palindrome (3312210122133).

The spelling of 1211100111012 in words is "one trillion, two hundred eleven billion, one hundred million, one hundred eleven thousand, twelve".