200030921 has 4 divisors (see below), whose sum is σ = 200060292. Its totient is φ = 200001552.

The previous prime is 200030911. The next prime is 200030933. The reversal of 200030921 is 129030002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5707321 + 194323600 = 2389^2 + 13940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200030921 is a prime.

It is a super-2 number, since 2×200030921² = 80024738712216482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 200030921.

It is not an unprimeable number, because it can be changed into a prime (200030911) 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, 1415 + ... + 20051.

It is an arithmetic number, because the mean of its divisors is an integer number (50015073).

Almost surely, 2^200030921 is an apocalyptic number.

It is an amenable number.

200030921 is a deficient number, since it is larger than the sum of its proper divisors (29371).

200030921 is a wasteful number, since it uses less digits than its factorization.

200030921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29370.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 200030921 is about 14143.2288039189. The cubic root of 200030921 is about 584.8336839404.

Adding to 200030921 its reverse (129030002), we get a palindrome (329060923).

The spelling of 200030921 in words is "two hundred million, thirty thousand, nine hundred twenty-one".