200021001 has 16 divisors (see below), whose sum is σ = 280589568. Its totient is φ = 126576000.

The previous prime is 200020991. The next prime is 200021009. The reversal of 200021001 is 100120002.

It is a happy number.

It is not a de Polignac number, because 200021001 - 2⁶ = 200020937 is a prime.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 17425 + ... + 26526.

It is an arithmetic number, because the mean of its divisors is an integer number (17536848).

Almost surely, 2^200021001 is an apocalyptic number.

It is an amenable number.

200021001 is a deficient number, since it is larger than the sum of its proper divisors (80568567).

200021001 is a wasteful number, since it uses less digits than its factorization.

200021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44032.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 200021001 is about 14142.8781017161. The cubic root of 200021001 is about 584.8240160250.

Adding to 200021001 its reverse (100120002), we get a palindrome (300141003).

Subtracting from 200021001 its reverse (100120002), we obtain a palindrome (99900999).

It can be divided in two parts, 20002 and 1001, that multiplied together give a palindrome (20022002).

The spelling of 200021001 in words is "two hundred million, twenty-one thousand, one".