201220121211221 has 16 divisors (see below), whose sum is σ = 240031341871104. Its totient is φ = 164929458673584.

The previous prime is 201220121211191. The next prime is 201220121211257. The reversal of 201220121211221 is 122112121022102.

It is a cyclic number.

It is not a de Polignac number, because 201220121211221 - 2¹⁴ = 201220121194837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201220121211193 and 201220121211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220121214221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173832071 + ... + 174985796.

It is an arithmetic number, because the mean of its divisors is an integer number (15001958866944).

Almost surely, 2^{201220121211221} is an apocalyptic number.

It is an amenable number.

201220121211221 is a deficient number, since it is larger than the sum of its proper divisors (38811220659883).

201220121211221 is a wasteful number, since it uses less digits than its factorization.

201220121211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348821480.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 201220121211221 its reverse (122112121022102), we get a palindrome (323332242233323).

The spelling of 201220121211221 in words is "two hundred one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".