200121220211221 has 24 divisors (see below), whose sum is σ = 216611968698504. Its totient is φ = 184782479831040.

The previous prime is 200121220211207. The next prime is 200121220211233. The reversal of 200121220211221 is 122112022121002.

It can be written as a sum of positive squares in 12 ways, for example, as 13757385719025 + 186363834492196 = 3709095^2 + 13651514^2 .

It is not a de Polignac number, because 200121220211221 - 2²⁹ = 200120683340309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121220211281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 218284641 + ... + 219199513.

It is an arithmetic number, because the mean of its divisors is an integer number (9025498695771).

Almost surely, 2^{200121220211221} is an apocalyptic number.

It is an amenable number.

200121220211221 is a deficient number, since it is larger than the sum of its proper divisors (16490748487283).

200121220211221 is a wasteful number, since it uses less digits than its factorization.

200121220211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929241 (or 929224 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 200121220211221 its reverse (122112022121002), we get a palindrome (322233242332223).

The spelling of 200121220211221 in words is "two hundred trillion, one hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty-one".