1211210112120 has 32 divisors (see below), whose sum is σ = 3633630336720. Its totient is φ = 322989363200.

The previous prime is 1211210112113. The next prime is 1211210112187. The reversal of 1211210112120 is 212110121121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1211210112120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5046708681 + ... + 5046708920.

Almost surely, 2^{1211210112120} is an apocalyptic number.

1211210112120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211210112120 is an abundant number, since it is smaller than the sum of its proper divisors (2422420224600).

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

1211210112120 is a wasteful number, since it uses less digits than its factorization.

1211210112120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10093417615 (or 10093417611 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211210112120 its reverse (212110121121), we get a palindrome (1423320233241).

Subtracting from 1211210112120 its reverse (212110121121), we obtain a palindrome (999099990999).

The spelling of 1211210112120 in words is "one trillion, two hundred eleven billion, two hundred ten million, one hundred twelve thousand, one hundred twenty".