200121804 has 72 divisors (see below), whose sum is σ = 533306592. Its totient is φ = 63148800.

The previous prime is 200121769. The next prime is 200121809. The reversal of 200121804 is 408121002.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (200121809) 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, 82432 + ... + 84824.

It is an arithmetic number, because the mean of its divisors is an integer number (7407036).

Almost surely, 2^200121804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 200121804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266653296).

200121804 is an abundant number, since it is smaller than the sum of its proper divisors (333184788).

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

200121804 is a wasteful number, since it uses less digits than its factorization.

200121804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527 (or 2522 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 200121804 is about 14146.4413899751. The cubic root of 200121804 is about 584.9222425688.

Adding to 200121804 its reverse (408121002), we get a palindrome (608242806).

The spelling of 200121804 in words is "two hundred million, one hundred twenty-one thousand, eight hundred four".