2209800021 has 16 divisors (see below), whose sum is σ = 3461505600. Its totient is φ = 1236251520.

The previous prime is 2209800011. The next prime is 2209800031. The reversal of 2209800021 is 1200089022.

It is an interprime number because it is at equal distance from previous prime (2209800011) and next prime (2209800031).

It is a de Polignac number, because none of the positive numbers 2^k-2209800021 is a prime.

It is a super-3 number, since 3×2209800021³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 2209799964 and 2209800000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2209800011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2575096 + ... + 2575953.

It is an arithmetic number, because the mean of its divisors is an integer number (216344100).

Almost surely, 2^2209800021 is an apocalyptic number.

It is an amenable number.

2209800021 is a deficient number, since it is larger than the sum of its proper divisors (1251705579).

2209800021 is a wasteful number, since it uses less digits than its factorization.

2209800021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151076.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 2209800021 is about 47008.5100912590. The cubic root of 2209800021 is about 1302.5197717805.

Adding to 2209800021 its reverse (1200089022), we get a palindrome (3409889043).

The spelling of 2209800021 in words is "two billion, two hundred nine million, eight hundred thousand, twenty-one".