201220111221221 has 8 divisors (see below), whose sum is σ = 202108355923680. Its totient is φ = 200331882418288.

The previous prime is 201220111221161. The next prime is 201220111221253. The reversal of 201220111221221 is 122122111022102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201220111221221 - 2¹⁴ = 201220111204837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201220111221193 and 201220111221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220111221421) 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 7 ways as a sum of consecutive naturals, for example, 21759350 + ... + 29595768.

It is an arithmetic number, because the mean of its divisors is an integer number (25263544490460).

Almost surely, 2^{201220111221221} is an apocalyptic number.

It is an amenable number.

201220111221221 is a deficient number, since it is larger than the sum of its proper divisors (888244702459).

201220111221221 is a wasteful number, since it uses less digits than its factorization.

201220111221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7949763.

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

Adding to 201220111221221 its reverse (122122111022102), we get a palindrome (323342222243323).

The spelling of 201220111221221 in words is "two hundred one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".