1212101112112 has 40 divisors (see below), whose sum is σ = 2610279516240. Its totient is φ = 540559668480.

The previous prime is 1212101112109. The next prime is 1212101112149. The reversal of 1212101112112 is 2112111012121.

It is a Harshad number since it is a multiple of its sum of digits (16).

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 7 ways as a sum of consecutive naturals, for example, 64961787 + ... + 64980442.

It is an arithmetic number, because the mean of its divisors is an integer number (65256987906).

Almost surely, 2^{1212101112112} is an apocalyptic number.

It is an amenable number.

1212101112112 is an abundant number, since it is smaller than the sum of its proper divisors (1398178404128).

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

1212101112112 is a wasteful number, since it uses less digits than its factorization.

1212101112112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129942301 (or 129942295 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1212101112112 its reverse (2112111012121), we get a palindrome (3324212124233).

Subtracting 1212101112112 from its reverse (2112111012121), we obtain a palindrome (900009900009).

The spelling of 1212101112112 in words is "one trillion, two hundred twelve billion, one hundred one million, one hundred twelve thousand, one hundred twelve".