1211111011212 has 24 divisors (see below), whose sum is σ = 2830063231296. Its totient is φ = 403112593488.

The previous prime is 1211111011211. The next prime is 1211111011249. The reversal of 1211111011212 is 2121101111121.

It is a junction number, because it is equal to n+sod(n) for n = 1211111011191 and 1211111011200.

It is not an unprimeable number, because it can be changed into a prime (1211111011211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73876078 + ... + 73892469.

It is an arithmetic number, because the mean of its divisors is an integer number (117919301304).

Almost surely, 2^{1211111011212} is an apocalyptic number.

1211111011212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211111011212 is an abundant number, since it is smaller than the sum of its proper divisors (1618952220084).

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

1211111011212 is a wasteful number, since it uses less digits than its factorization.

1211111011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147769237 (or 147769235 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1211111011212 its reverse (2121101111121), we get a palindrome (3332212122333).

Subtracting 1211111011212 from its reverse (2121101111121), we obtain a palindrome (909990099909).

The spelling of 1211111011212 in words is "one trillion, two hundred eleven billion, one hundred eleven million, eleven thousand, two hundred twelve".