200212100021 has 4 divisors (see below), whose sum is σ = 200213609100. Its totient is φ = 200210590944.

The previous prime is 200212100017. The next prime is 200212100041. The reversal of 200212100021 is 120001212002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105033679921 + 95178420100 = 324089^2 + 308510^2 .

It is a cyclic number.

It is not a de Polignac number, because 200212100021 - 2² = 200212100017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200212099975 and 200212100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200212100041) 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, 534056 + ... + 828033.

It is an arithmetic number, because the mean of its divisors is an integer number (50053402275).

Almost surely, 2^200212100021 is an apocalyptic number.

It is an amenable number.

200212100021 is a deficient number, since it is larger than the sum of its proper divisors (1509079).

200212100021 is a wasteful number, since it uses less digits than its factorization.

200212100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509078.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 200212100021 its reverse (120001212002), we get a palindrome (320213312023).

The spelling of 200212100021 in words is "two hundred billion, two hundred twelve million, one hundred thousand, twenty-one".