1211111211020 has 24 divisors (see below), whose sum is σ = 2543508013200. Its totient is φ = 484411252032.

The previous prime is 1211111211019. The next prime is 1211111211041. The reversal of 1211111211020 is 201121111121.

It is a junction number, because it is equal to n+sod(n) for n = 1211111210986 and 1211111211004.

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, 1777130 + ... + 2362289.

It is an arithmetic number, because the mean of its divisors is an integer number (105979500550).

Almost surely, 2^{1211111211020} is an apocalyptic number.

1211111211020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211111211020 is an abundant number, since it is smaller than the sum of its proper divisors (1332396802180).

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

1211111211020 is a wasteful number, since it uses less digits than its factorization.

1211111211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4154057 (or 4154055 counting only the distinct ones).

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

Adding to 1211111211020 its reverse (201121111121), we get a palindrome (1412232322141).

The spelling of 1211111211020 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred eleven thousand, twenty".