200021102020 has 72 divisors (see below), whose sum is σ = 441157848768. Its totient is φ = 76161052800.

The previous prime is 200021101997. The next prime is 200021102023. The reversal of 200021102020 is 20201120002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 200021101988 and 200021102006.

It is not an unprimeable number, because it can be changed into a prime (200021102023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1110475 + ... + 1277965.

It is an arithmetic number, because the mean of its divisors is an integer number (6127192344).

Almost surely, 2^200021102020 is an apocalyptic number.

200021102020 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 200021102020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220578924384).

200021102020 is an abundant number, since it is smaller than the sum of its proper divisors (241136746748).

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

200021102020 is a wasteful number, since it uses less digits than its factorization.

200021102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167629 (or 167598 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 200021102020 its reverse (20201120002), we get a palindrome (220222222022).

The spelling of 200021102020 in words is "two hundred billion, twenty-one million, one hundred two thousand, twenty".