2000121221 has 16 divisors (see below), whose sum is σ = 2344742400. Its totient is φ = 1670418288.

The previous prime is 2000121217. The next prime is 2000121223. The reversal of 2000121221 is 1221210002.

It is a happy number.

It is not a de Polignac number, because 2000121221 - 2² = 2000121217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2000121223) 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, 118190 + ... + 134048.

It is an arithmetic number, because the mean of its divisors is an integer number (146546400).

Almost surely, 2^2000121221 is an apocalyptic number.

It is an amenable number.

2000121221 is a deficient number, since it is larger than the sum of its proper divisors (344621179).

2000121221 is a wasteful number, since it uses less digits than its factorization.

2000121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16328.

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

The square root of 2000121221 is about 44722.7148214417. The cubic root of 2000121221 is about 1259.9465041955.

Adding to 2000121221 its reverse (1221210002), we get a palindrome (3221331223).

The spelling of 2000121221 in words is "two billion, one hundred twenty-one thousand, two hundred twenty-one".