1211121100212 has 48 divisors (see below), whose sum is σ = 2833783646400. Its totient is φ = 402588813312.

The previous prime is 1211121100201. The next prime is 1211121100213. The reversal of 1211121100212 is 2120011211121.

It is a happy number.

It is a super-3 number, since 3×1211121100212³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211121100191 and 1211121100200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211121100213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9999198 + ... + 10119594.

It is an arithmetic number, because the mean of its divisors is an integer number (59037159300).

Almost surely, 2^{1211121100212} is an apocalyptic number.

1211121100212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211121100212 is an abundant number, since it is smaller than the sum of its proper divisors (1622662546188).

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

1211121100212 is a wasteful number, since it uses less digits than its factorization.

1211121100212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122720 (or 122718 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211121100212 its reverse (2120011211121), we get a palindrome (3331132311333).

The spelling of 1211121100212 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred thousand, two hundred twelve".