1211121212012 has 12 divisors (see below), whose sum is σ = 2244136363560. Its totient is φ = 569939393856.

The previous prime is 1211121212011. The next prime is 1211121212051. The reversal of 1211121212012 is 2102121211121.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (1211121212011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8905302962 + ... + 8905303097.

It is an arithmetic number, because the mean of its divisors is an integer number (187011363630).

Almost surely, 2^{1211121212012} is an apocalyptic number.

It is an amenable number.

1211121212012 is a deficient number, since it is larger than the sum of its proper divisors (1033015151548).

1211121212012 is a wasteful number, since it uses less digits than its factorization.

1211121212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17810606080 (or 17810606078 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211121212012 its reverse (2102121211121), we get a palindrome (3313242423133).

The spelling of 1211121212012 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twelve thousand, twelve".