200121020020 has 12 divisors (see below), whose sum is σ = 420254142084. Its totient is φ = 80048408000.

The previous prime is 200121020009. The next prime is 200121020023. The reversal of 200121020020 is 20020121002.

It can be written as a sum of positive squares in 2 ways, for example, as 137354736996 + 62766283024 = 370614^2 + 250532^2 .

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 = 200121019979 and 200121020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121020023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5003025481 + ... + 5003025520.

It is an arithmetic number, because the mean of its divisors is an integer number (35021178507).

Almost surely, 2^200121020020 is an apocalyptic number.

200121020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200121020020 is an abundant number, since it is smaller than the sum of its proper divisors (220133122064).

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

200121020020 is a wasteful number, since it uses less digits than its factorization.

200121020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10006051010 (or 10006051008 counting only the distinct ones).

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

Adding to 200121020020 its reverse (20020121002), we get a palindrome (220141141022).

The spelling of 200121020020 in words is "two hundred billion, one hundred twenty-one million, twenty thousand, twenty".