200021004 has 72 divisors (see below), whose sum is σ = 525666960. Its totient is φ = 64052352.

The previous prime is 200020991. The next prime is 200021009. The reversal of 200021004 is 400120002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200021009) 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, 295114 + ... + 295790.

It is an arithmetic number, because the mean of its divisors is an integer number (7300930).

Almost surely, 2^200021004 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 200021004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262833480).

200021004 is an abundant number, since it is smaller than the sum of its proper divisors (325645956).

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

200021004 is a wasteful number, since it uses less digits than its factorization.

200021004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 200021004 is about 14142.8782077765. The cubic root of 200021004 is about 584.8240189488.

Adding to 200021004 its reverse (400120002), we get a palindrome (600141006).

The spelling of 200021004 in words is "two hundred million, twenty-one thousand, four".