1201221220020 has 96 divisors (see below), whose sum is σ = 3481091510400. Its totient is φ = 309129537024.

The previous prime is 1201221219839. The next prime is 1201221220027. The reversal of 1201221220020 is 200221221021.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201221220027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3433227 + ... + 3766893.

It is an arithmetic number, because the mean of its divisors is an integer number (36261369900).

Almost surely, 2^{1201221220020} is an apocalyptic number.

1201221220020 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 1201221220020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1740545755200).

1201221220020 is an abundant number, since it is smaller than the sum of its proper divisors (2279870290380).

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

1201221220020 is a wasteful number, since it uses less digits than its factorization.

1201221220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335777 (or 335775 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1201221220020 its reverse (200221221021), we get a palindrome (1401442441041).

It can be divided in two parts, 1201221 and 220020, that added together give a palindrome (1421241).

The spelling of 1201221220020 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two hundred twenty thousand, twenty".