200121111201221 has 6 divisors (see below), whose sum is σ = 232793945683110. Its totient is φ = 171532381029576.

The previous prime is 200121111201163. The next prime is 200121111201233. The reversal of 200121111201221 is 122102111121002.

200121111201221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 143915892285025 + 56205218916196 = 11996495^2 + 7497014^2 .

It is not a de Polignac number, because 200121111201221 - 2⁶ = 200121111201157 is a prime.

It is a super-2 number, since 2×200121111201221² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 200121111201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121111201281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2042052155066 + ... + 2042052155163.

It is an arithmetic number, because the mean of its divisors is an integer number (38798990947185).

Almost surely, 2^{200121111201221} is an apocalyptic number.

It is an amenable number.

200121111201221 is a deficient number, since it is larger than the sum of its proper divisors (32672834481889).

200121111201221 is an equidigital number, since it uses as much as digits as its factorization.

200121111201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4084104310243 (or 4084104310236 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 200121111201221 its reverse (122102111121002), we get a palindrome (322223222322223).

The spelling of 200121111201221 in words is "two hundred trillion, one hundred twenty-one billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".