200212121221 has 16 divisors (see below), whose sum is σ = 236892297600. Its totient is φ = 165560971968.

The previous prime is 200212121209. The next prime is 200212121227. The reversal of 200212121221 is 122121212002.

It is a happy number.

It is not a de Polignac number, because 200212121221 - 2⁵ = 200212121189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200212121195 and 200212121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200212121227) 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, 136110 + ... + 647263.

It is an arithmetic number, because the mean of its divisors is an integer number (14805768600).

Almost surely, 2^200212121221 is an apocalyptic number.

It is an amenable number.

200212121221 is a deficient number, since it is larger than the sum of its proper divisors (36680176379).

200212121221 is a wasteful number, since it uses less digits than its factorization.

200212121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784668.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 200212121221 its reverse (122121212002), we get a palindrome (322333333223).

The spelling of 200212121221 in words is "two hundred billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".