201220111222021 has 16 divisors (see below), whose sum is σ = 207816618441600. Its totient is φ = 194706817804800.

The previous prime is 201220111221991. The next prime is 201220111222027. The reversal of 201220111222021 is 120222111022102.

It is a cyclic number.

It is not a de Polignac number, because 201220111222021 - 2¹¹ = 201220111219973 is a prime.

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 201220111222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220111222027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11746225 + ... + 23246806.

It is an arithmetic number, because the mean of its divisors is an integer number (12988538652600).

Almost surely, 2^{201220111222021} is an apocalyptic number.

It is an amenable number.

201220111222021 is a deficient number, since it is larger than the sum of its proper divisors (6596507219579).

201220111222021 is a wasteful number, since it uses less digits than its factorization.

201220111222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34994220.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 201220111222021 its reverse (120222111022102), we get a palindrome (321442222244123).

The spelling of 201220111222021 in words is "two hundred one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-two thousand, twenty-one".