200120102121221 has 4 divisors (see below), whose sum is σ = 211891872834252. Its totient is φ = 188348331408192.

The previous prime is 200120102121167. The next prime is 200120102121229. The reversal of 200120102121221 is 122121201021002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64768517356321 + 135351584764900 = 8047889^2 + 11634070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200120102121221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 11771770713013 = 200120102121221 / (2 + 0 + 0 + 1 + 2 + 0 + 1 + 0 + 2 + 1 + 2 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 200120102121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200120102121229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5885885356490 + ... + 5885885356523.

It is an arithmetic number, because the mean of its divisors is an integer number (52972968208563).

Almost surely, 2^{200120102121221} is an apocalyptic number.

It is an amenable number.

200120102121221 is a deficient number, since it is larger than the sum of its proper divisors (11771770713031).

200120102121221 is a wasteful number, since it uses less digits than its factorization.

200120102121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11771770713030.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 200120102121221 its reverse (122121201021002), we get a palindrome (322241303142223).

The spelling of 200120102121221 in words is "two hundred trillion, one hundred twenty billion, one hundred two million, one hundred twenty-one thousand, two hundred twenty-one".