200121102221 has 8 divisors (see below), whose sum is σ = 201994212024. Its totient is φ = 198256226560.

The previous prime is 200121102217. The next prime is 200121102253. The reversal of 200121102221 is 122201121002.

It can be written as a sum of positive squares in 4 ways, for example, as 95477910025 + 104643192196 = 308995^2 + 323486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 200121102221 - 2² = 200121102217 is a prime.

It is a super-2 number, since 2×200121102221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200121102196 and 200121102205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121102521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2009696 + ... + 2106921.

It is an arithmetic number, because the mean of its divisors is an integer number (25249276503).

Almost surely, 2^200121102221 is an apocalyptic number.

It is an amenable number.

200121102221 is a deficient number, since it is larger than the sum of its proper divisors (1873109803).

200121102221 is a wasteful number, since it uses less digits than its factorization.

200121102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4117071.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 200121102221 its reverse (122201121002), we get a palindrome (322322223223).

The spelling of 200121102221 in words is "two hundred billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty-one".