1211121121100 has 72 divisors (see below), whose sum is σ = 3017951630400. Its totient is φ = 417228321600.

The previous prime is 1211121121061. The next prime is 1211121121121. The reversal of 1211121121100 is 11211211121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28953290 + ... + 28995089.

Almost surely, 2^{1211121121100} is an apocalyptic number.

1211121121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211121121100 is an abundant number, since it is smaller than the sum of its proper divisors (1806830509300).

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

1211121121100 is a wasteful number, since it uses less digits than its factorization.

1211121121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57948423 (or 57948416 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211121121100 its reverse (11211211121), we get a palindrome (1222332332221).

The spelling of 1211121121100 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred".