1212121221112 has 32 divisors (see below), whose sum is σ = 2347353302400. Its totient is φ = 586182211200.

The previous prime is 1212121221071. The next prime is 1212121221127. The reversal of 1212121221112 is 2111221212121.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1212121221112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922339 + ... + 1809682.

It is an arithmetic number, because the mean of its divisors is an integer number (73354790700).

Almost surely, 2^{1212121221112} is an apocalyptic number.

It is an amenable number.

1212121221112 is a deficient number, since it is larger than the sum of its proper divisors (1135232081288).

1212121221112 is a wasteful number, since it uses less digits than its factorization.

1212121221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733847 (or 2733843 counting only the distinct ones).

The product of its digits is 64, while the sum is 19.

Adding to 1212121221112 its reverse (2111221212121), we get a palindrome (3323342433233).

The spelling of 1212121221112 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twelve".