200120211012221 has 4 divisors (see below), whose sum is σ = 200120239708572. Its totient is φ = 200120182315872.

The previous prime is 200120211012217. The next prime is 200120211012287. The reversal of 200120211012221 is 122210112021002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6918272928121 + 193201938084100 = 2630261^2 + 13899710^2 .

It is a cyclic number.

It is not a de Polignac number, because 200120211012221 - 2² = 200120211012217 is a prime.

It is a super-2 number, since 2×200120211012221² (a number of 29 digits) contains 22 as substring.

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 200120211012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200120211012121) 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, 3577241 + ... + 20323313.

It is an arithmetic number, because the mean of its divisors is an integer number (50030059927143).

Almost surely, 2^{200120211012221} is an apocalyptic number.

It is an amenable number.

200120211012221 is a deficient number, since it is larger than the sum of its proper divisors (28696351).

200120211012221 is a wasteful number, since it uses less digits than its factorization.

200120211012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28696350.

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

Adding to 200120211012221 its reverse (122210112021002), we get a palindrome (322330323033223).

The spelling of 200120211012221 in words is "two hundred trillion, one hundred twenty billion, two hundred eleven million, twelve thousand, two hundred twenty-one".