221220200111121 has 24 divisors (see below), whose sum is σ = 338339151230184. Its totient is φ = 138803857251840.

The previous prime is 221220200111069. The next prime is 221220200111129. The reversal of 221220200111121 is 121111002022122.

221220200111121 is a `hidden beast` number, since 2 + 212 + 20 + 200 + 111 + 121 = 666.

221220200111121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 138699236460096 + 82520963651025 = 11777064^2 + 9084105^2 .

It is not a de Polignac number, because 221220200111121 - 2²² = 221220195916817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221220200111094 and 221220200111103.

It is not an unprimeable number, because it can be changed into a prime (221220200111129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17113135 + ... + 27116411.

It is an arithmetic number, because the mean of its divisors is an integer number (14097464634591).

Almost surely, 2^{221220200111121} is an apocalyptic number.

It is an amenable number.

221220200111121 is a deficient number, since it is larger than the sum of its proper divisors (117118951119063).

221220200111121 is a wasteful number, since it uses less digits than its factorization.

221220200111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10147841 (or 10147838 counting only the distinct ones).

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

Adding to 221220200111121 its reverse (121111002022122), we get a palindrome (342331202133243).

The spelling of 221220200111121 in words is "two hundred twenty-one trillion, two hundred twenty billion, two hundred million, one hundred eleven thousand, one hundred twenty-one".