201021111220101 has 16 divisors (see below), whose sum is σ = 268076525359104. Its totient is φ = 133989886485504.

The previous prime is 201021111220099. The next prime is 201021111220109. The reversal of 201021111220101 is 101022111120102.

It is a happy number.

It is not a de Polignac number, because 201021111220101 - 2¹ = 201021111220099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021111220109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1589878581 + ... + 1590005013.

It is an arithmetic number, because the mean of its divisors is an integer number (16754782834944).

Almost surely, 2^{201021111220101} is an apocalyptic number.

It is an amenable number.

201021111220101 is a deficient number, since it is larger than the sum of its proper divisors (67055414139003).

201021111220101 is a wasteful number, since it uses less digits than its factorization.

201021111220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217900.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 201021111220101 its reverse (101022111120102), we get a palindrome (302043222340203).

Subtracting from 201021111220101 its reverse (101022111120102), we obtain a palindrome (99999000099999).

The spelling of 201021111220101 in words is "two hundred one trillion, twenty-one billion, one hundred eleven million, two hundred twenty thousand, one hundred one".