203121041220 has 144 divisors (see below), whose sum is σ = 621693491328. Its totient is φ = 53678822400.

The previous prime is 203121041213. The next prime is 203121041239. The reversal of 203121041220 is 22140121302.

It is a happy number.

203121041220 is a `hidden beast` number, since 20 + 3 + 1 + 210 + 412 + 20 = 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 = 203121041193 and 203121041202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10120195 + ... + 10140245.

It is an arithmetic number, because the mean of its divisors is an integer number (4317315912).

Almost surely, 2^203121041220 is an apocalyptic number.

203121041220 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 203121041220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310846745664).

203121041220 is an abundant number, since it is smaller than the sum of its proper divisors (418572450108).

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

203121041220 is a wasteful number, since it uses less digits than its factorization.

203121041220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20570 (or 20565 counting only the distinct ones).

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

Adding to 203121041220 its reverse (22140121302), we get a palindrome (225261162522).

The spelling of 203121041220 in words is "two hundred three billion, one hundred twenty-one million, forty-one thousand, two hundred twenty".