1212201122020 has 96 divisors (see below), whose sum is σ = 2953293090048. Its totient is φ = 409327091712.

The previous prime is 1212201121993. The next prime is 1212201122029. The reversal of 1212201122020 is 202211022121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1212201121985 and 1212201122003.

It is not an unprimeable number, because it can be changed into a prime (1212201122029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64084084 + ... + 64102996.

It is an arithmetic number, because the mean of its divisors is an integer number (30763469688).

Almost surely, 2^{1212201122020} is an apocalyptic number.

1212201122020 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 1212201122020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1476646545024).

1212201122020 is an abundant number, since it is smaller than the sum of its proper divisors (1741091968028).

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

1212201122020 is a wasteful number, since it uses less digits than its factorization.

1212201122020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25829 (or 25827 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1212201122020 its reverse (202211022121), we get a palindrome (1414412144141).

The spelling of 1212201122020 in words is "one trillion, two hundred twelve billion, two hundred one million, one hundred twenty-two thousand, twenty".