200021121121221 has 12 divisors (see below), whose sum is σ = 290759648114572. Its totient is φ = 132498067493376.

The previous prime is 200021121121207. The next prime is 200021121121249. The reversal of 200021121121221 is 122121121120002.

200021121121221 is a `hidden beast` number, since 2 + 0 + 0 + 0 + 211 + 211 + 21 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 59581201080996 + 140439920040225 = 7718886^2 + 11850735^2 .

It is a de Polignac number, because none of the positive numbers 2^k-200021121121221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200021121121194 and 200021121121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200021122121221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70778880796 + ... + 70778883621.

Almost surely, 2^{200021121121221} is an apocalyptic number.

It is an amenable number.

200021121121221 is a deficient number, since it is larger than the sum of its proper divisors (90738526993351).

200021121121221 is a wasteful number, since it uses less digits than its factorization.

200021121121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141557764580 (or 141557764577 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 200021121121221 its reverse (122121121120002), we get a palindrome (322142242241223).

The spelling of 200021121121221 in words is "two hundred trillion, twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".