200109021 has 16 divisors (see below), whose sum is σ = 306244224. Its totient is φ = 113854464.

The previous prime is 200109011. The next prime is 200109031. The reversal of 200109021 is 120901002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (200109011) and next prime (200109031).

It is not a de Polignac number, because 200109021 - 2⁶ = 200108957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200109011) 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, 15556 + ... + 25341.

It is an arithmetic number, because the mean of its divisors is an integer number (19140264).

Almost surely, 2^200109021 is an apocalyptic number.

200109021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

200109021 is a deficient number, since it is larger than the sum of its proper divisors (106135203).

200109021 is a wasteful number, since it uses less digits than its factorization.

200109021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41140.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 200109021 is about 14145.9895730203. The cubic root of 200109021 is about 584.9097881201.

The spelling of 200109021 in words is "two hundred million, one hundred nine thousand, twenty-one".