202131221220 has 144 divisors (see below), whose sum is σ = 622324684800. Its totient is φ = 53098848000.

The previous prime is 202131221191. The next prime is 202131221261. The reversal of 202131221220 is 22122131202.

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 = 202131221193 and 202131221202.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 3589885 + ... + 3645755.

It is an arithmetic number, because the mean of its divisors is an integer number (4321699200).

Almost surely, 2^202131221220 is an apocalyptic number.

202131221220 is a gapful number since it is divisible by the number (20) 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 202131221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311162342400).

202131221220 is an abundant number, since it is smaller than the sum of its proper divisors (420193463580).

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

202131221220 is a wasteful number, since it uses less digits than its factorization.

202131221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56186 (or 56181 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 202131221220 its reverse (22122131202), we get a palindrome (224253352422).

The spelling of 202131221220 in words is "two hundred two billion, one hundred thirty-one million, two hundred twenty-one thousand, two hundred twenty".