200121020 has 48 divisors (see below), whose sum is σ = 460107648. Its totient is φ = 72509760.

The previous prime is 200121013. The next prime is 200121023. The reversal of 200121020 is 20121002.

It is a junction number, because it is equal to n+sod(n) for n = 200120989 and 200121007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66059 + ... + 69021.

It is an arithmetic number, because the mean of its divisors is an integer number (9585576).

Almost surely, 2^200121020 is an apocalyptic number.

200121020 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 200121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230053824).

200121020 is an abundant number, since it is smaller than the sum of its proper divisors (259986628).

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

200121020 is a wasteful number, since it uses less digits than its factorization.

200121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290 (or 3288 counting only the distinct ones).

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

The square root of 200121020 is about 14146.4136797988. The cubic root of 200121020 is about 584.9214787346.

Adding to 200121020 its reverse (20121002), we get a palindrome (220242022).

The spelling of 200121020 in words is "two hundred million, one hundred twenty-one thousand, twenty".