1211122221120 has 896 divisors, whose sum is σ = 4954438656000. Its totient is φ = 272802816000.

The previous prime is 1211122221109. The next prime is 1211122221131. The reversal of 1211122221120 is 211222211121.

1211122221120 is a `hidden beast` number, since 1 + 211 + 1 + 222 + 211 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (1211122221109) and next prime (1211122221131).

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 = 1211122221093 and 1211122221102.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2021906581 + ... + 2021907179.

Almost surely, 2^{1211122221120} is an apocalyptic number.

1211122221120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211122221120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2477219328000).

1211122221120 is an abundant number, since it is smaller than the sum of its proper divisors (3743316434880).

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

1211122221120 is a wasteful number, since it uses less digits than its factorization.

1211122221120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1048 counting only the distinct ones).

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

Adding to 1211122221120 its reverse (211222211121), we get a palindrome (1422344432241).

Subtracting from 1211122221120 its reverse (211222211121), we obtain a palindrome (999900009999).

The spelling of 1211122221120 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty".