1211331111120 has 120 divisors (see below), whose sum is σ = 4380980885736. Its totient is φ = 298173809664.

The previous prime is 1211331111091. The next prime is 1211331111121. The reversal of 1211331111120 is 211111331121.

1211331111120 is a `hidden beast` number, since 1 + 211 + 331 + 1 + 1 + 1 + 120 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 246119178816 + 965211932304 = 496104^2 + 982452^2 .

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a junction number, because it is equal to n+sod(n) for n = 1211331111093 and 1211331111102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211331111121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64698499 + ... + 64717218.

Almost surely, 2^{1211331111120} is an apocalyptic number.

1211331111120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211331111120 is an abundant number, since it is smaller than the sum of its proper divisors (3169649774616).

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

1211331111120 is a wasteful number, since it uses less digits than its factorization.

1211331111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129415749 (or 129415740 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 1211331111120 its reverse (211111331121), we get a palindrome (1422442442241).

The spelling of 1211331111120 in words is "one trillion, two hundred eleven billion, three hundred thirty-one million, one hundred eleven thousand, one hundred twenty".