1211111212120 has 64 divisors (see below), whose sum is σ = 2798624714400. Its totient is φ = 471518284800.

The previous prime is 1211111212109. The next prime is 1211111212121. The reversal of 1211111212120 is 212121111121.

It is a junction number, because it is equal to n+sod(n) for n = 1211111212094 and 1211111212103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111212121) 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, 2302149 + ... + 2778868.

Almost surely, 2^{1211111212120} is an apocalyptic number.

1211111212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211111212120 is an abundant number, since it is smaller than the sum of its proper divisors (1587513502280).

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

1211111212120 is a wasteful number, since it uses less digits than its factorization.

1211111212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5081188 (or 5081184 counting only the distinct ones).

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

Adding to 1211111212120 its reverse (212121111121), we get a palindrome (1423232323241).

The spelling of 1211111212120 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty".