1211211121212 has 96 divisors (see below), whose sum is σ = 3305750918400. Its totient is φ = 382452840000.

The previous prime is 1211211121207. The next prime is 1211211121217. The reversal of 1211211121212 is 2121211121121.

It is a happy number.

1211211121212 is a `hidden beast` number, since 121 + 1 + 211 + 121 + 212 = 666.

It is an interprime number because it is at equal distance from previous prime (1211211121207) and next prime (1211211121217).

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211211121217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31439962 + ... + 31478462.

It is an arithmetic number, because the mean of its divisors is an integer number (34434905400).

Almost surely, 2^{1211211121212} is an apocalyptic number.

1211211121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211211121212 is an abundant number, since it is smaller than the sum of its proper divisors (2094539797188).

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

1211211121212 is a wasteful number, since it uses less digits than its factorization.

1211211121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53864 (or 53856 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 1211211121212 its reverse (2121211121121), we get a palindrome (3332422242333).

Subtracting 1211211121212 from its reverse (2121211121121), we obtain a palindrome (909999999909).

The spelling of 1211211121212 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twelve".