200540021 has 4 divisors (see below), whose sum is σ = 218770944. Its totient is φ = 182309100.

The previous prime is 200539987. The next prime is 200540047. The reversal of 200540021 is 120045002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 200540021 - 2⁶ = 200539957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200539978 and 200540005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200540321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9115445 + ... + 9115466.

It is an arithmetic number, because the mean of its divisors is an integer number (54692736).

Almost surely, 2^200540021 is an apocalyptic number.

It is an amenable number.

200540021 is a deficient number, since it is larger than the sum of its proper divisors (18230923).

200540021 is a wasteful number, since it uses less digits than its factorization.

200540021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18230922.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 200540021 is about 14161.2153786319. The cubic root of 200540021 is about 585.3294182852.

Adding to 200540021 its reverse (120045002), we get a palindrome (320585023).

The spelling of 200540021 in words is "two hundred million, five hundred forty thousand, twenty-one".