201221120002020 has 48 divisors (see below), whose sum is σ = 563443787430720. Its totient is φ = 53656617579136.

The previous prime is 201221120002003. The next prime is 201221120002027. The reversal of 201221120002020 is 20200021122102.

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

It is not an unprimeable number, because it can be changed into a prime (201221120002027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71984367 + ... + 74727446.

It is an arithmetic number, because the mean of its divisors is an integer number (11738412238140).

Almost surely, 2^{201221120002020} is an apocalyptic number.

201221120002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221120002020 is an abundant number, since it is smaller than the sum of its proper divisors (362222667428700).

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

201221120002020 is a wasteful number, since it uses less digits than its factorization.

201221120002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146734684 (or 146734682 counting only the distinct ones).

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

Adding to 201221120002020 its reverse (20200021122102), we get a palindrome (221421141124122).

The spelling of 201221120002020 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred twenty million, two thousand, twenty".