200001021 has 24 divisors (see below), whose sum is σ = 301056672. Its totient is φ = 117928800.

The previous prime is 200001019. The next prime is 200001047. The reversal of 200001021 is 120100002.

It is a happy number.

It is not a de Polignac number, because 200001021 - 2¹ = 200001019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200001001) 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, 5986 + ... + 20876.

It is an arithmetic number, because the mean of its divisors is an integer number (12544028).

Almost surely, 2^200001021 is an apocalyptic number.

It is an amenable number.

200001021 is a deficient number, since it is larger than the sum of its proper divisors (101055651).

200001021 is a wasteful number, since it uses less digits than its factorization.

200001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14953 (or 14942 counting only the distinct ones).

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

The square root of 200001021 is about 14142.1717214861. The cubic root of 200001021 is about 584.8045427816.

Adding to 200001021 its reverse (120100002), we get a palindrome (320101023).

The spelling of 200001021 in words is "two hundred million, one thousand, twenty-one".