1201123121220 has 288 divisors, whose sum is σ = 4296897521280. Its totient is φ = 268400148480.

The previous prime is 1201123121207. The next prime is 1201123121291. The reversal of 1201123121220 is 221213211021.

1201123121220 is a `hidden beast` number, since 1 + 20 + 112 + 312 + 1 + 220 = 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 = 1201123121193 and 1201123121202.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 960484 + ... + 1823396.

It is an arithmetic number, because the mean of its divisors is an integer number (14919783060).

Almost surely, 2^{1201123121220} is an apocalyptic number.

1201123121220 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 1201123121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2148448760640).

1201123121220 is an abundant number, since it is smaller than the sum of its proper divisors (3095774400060).

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

1201123121220 is a wasteful number, since it uses less digits than its factorization.

1201123121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862995 (or 862990 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1201123121220 its reverse (221213211021), we get a palindrome (1422336332241).

The spelling of 1201123121220 in words is "one trillion, two hundred one billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred twenty".