1211111111120 has 80 divisors (see below), whose sum is σ = 2897368855632. Its totient is φ = 470597836800.

The previous prime is 1211111111087. The next prime is 1211111111143. The reversal of 1211111111120 is 211111111121.

It can be written as a sum of positive squares in 8 ways, for example, as 2967198784 + 1208143912336 = 54472^2 + 1099156^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1211111111095 and 1211111111104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 985817 + ... + 1842296.

Almost surely, 2^{1211111111120} is an apocalyptic number.

1211111111120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211111111120 is an abundant number, since it is smaller than the sum of its proper divisors (1686257744512).

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

1211111111120 is a wasteful number, since it uses less digits than its factorization.

1211111111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2828280 (or 2828274 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 1211111111120 its reverse (211111111121), we get a palindrome (1422222222241).

Subtracting from 1211111111120 its reverse (211111111121), we obtain a palindrome (999999999999).

It can be divided in two parts, 1211111 and 111120, that added together give a palindrome (1322231).

The spelling of 1211111111120 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, one hundred twenty".