1211222112120 has 96 divisors (see below), whose sum is σ = 4042863040320. Its totient is φ = 314263031040.

The previous prime is 1211222112091. The next prime is 1211222112131. The reversal of 1211222112120 is 212112221121.

1211222112120 is a `hidden beast` number, since 1 + 211 + 222 + 112 + 120 = 666.

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 = 1211222112093 and 1211222112102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45452976 + ... + 45479615.

It is an arithmetic number, because the mean of its divisors is an integer number (42113156670).

Almost surely, 2^{1211222112120} is an apocalyptic number.

1211222112120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211222112120 is an abundant number, since it is smaller than the sum of its proper divisors (2831640928200).

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

1211222112120 is a wasteful number, since it uses less digits than its factorization.

1211222112120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90932645 (or 90932638 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211222112120 its reverse (212112221121), we get a palindrome (1423334333241).

The spelling of 1211222112120 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twelve thousand, one hundred twenty".