20010221001020 has 96 divisors (see below), whose sum is σ = 44220649697280. Its totient is φ = 7591377024000.

The previous prime is 20010221001019. The next prime is 20010221001103. The reversal of 20010221001020 is 2010012201002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20010221000992 and 20010221001010.

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, 25358996 + ... + 26136164.

It is an arithmetic number, because the mean of its divisors is an integer number (460631767680).

Almost surely, 2^{20010221001020} is an apocalyptic number.

20010221001020 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 20010221001020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22110324848640).

20010221001020 is an abundant number, since it is smaller than the sum of its proper divisors (24210428696260).

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

20010221001020 is a wasteful number, since it uses less digits than its factorization.

20010221001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777675 (or 777673 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20010221001020 its reverse (2010012201002), we get a palindrome (22020233202022).

The spelling of 20010221001020 in words is "twenty trillion, ten billion, two hundred twenty-one million, one thousand, twenty".