200021101020 has 72 divisors (see below), whose sum is σ = 653402270976. Its totient is φ = 49235962752.

The previous prime is 200021100991. The next prime is 200021101043. The reversal of 200021101020 is 20101120002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 200021100993 and 200021101011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42737212 + ... + 42741891.

Almost surely, 2^200021101020 is an apocalyptic number.

200021101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200021101020 is an abundant number, since it is smaller than the sum of its proper divisors (453381169956).

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

200021101020 is a wasteful number, since it uses less digits than its factorization.

200021101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85479131 (or 85479126 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 200021101020 its reverse (20101120002), we get a palindrome (220122221022).

The spelling of 200021101020 in words is "two hundred billion, twenty-one million, one hundred one thousand, twenty".