200120202121221 has 16 divisors (see below), whose sum is σ = 296668021107520. Its totient is φ = 133326326663280.

The previous prime is 200120202121193. The next prime is 200120202121237. The reversal of 200120202121221 is 122121202021002.

It is a happy number.

200120202121221 is a `hidden beast` number, since 2 + 0 + 0 + 120 + 202 + 121 + 221 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-200120202121221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200120202121194 and 200120202121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200120202121291) 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, 2420552830 + ... + 2420635503.

It is an arithmetic number, because the mean of its divisors is an integer number (18541751319220).

Almost surely, 2^{200120202121221} is an apocalyptic number.

It is an amenable number.

200120202121221 is a deficient number, since it is larger than the sum of its proper divisors (96547818986299).

200120202121221 is a wasteful number, since it uses less digits than its factorization.

200120202121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4841189873 (or 4841189867 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 200120202121221 its reverse (122121202021002), we get a palindrome (322241404142223).

The spelling of 200120202121221 in words is "two hundred trillion, one hundred twenty billion, two hundred two million, one hundred twenty-one thousand, two hundred twenty-one".