220121201020 has 96 divisors (see below), whose sum is σ = 539175329280. Its totient is φ = 73927814400.

The previous prime is 220121201009. The next prime is 220121201039. The reversal of 220121201020 is 20102121022.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1613470 + ... + 1744570.

It is an arithmetic number, because the mean of its divisors is an integer number (5616409680).

Almost surely, 2^220121201020 is an apocalyptic number.

220121201020 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 220121201020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269587664640).

220121201020 is an abundant number, since it is smaller than the sum of its proper divisors (319054128260).

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

220121201020 is a wasteful number, since it uses less digits than its factorization.

220121201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131363 (or 131361 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 220121201020 its reverse (20102121022), we get a palindrome (240223322042).

The spelling of 220121201020 in words is "two hundred twenty billion, one hundred twenty-one million, two hundred one thousand, twenty".