221021200111101 has 64 divisors (see below), whose sum is σ = 319086013720320. Its totient is φ = 135276721274880.

The previous prime is 221021200111099. The next prime is 221021200111141. The reversal of 221021200111101 is 101111002120122.

It is a happy number.

It is not a de Polignac number, because 221021200111101 - 2¹ = 221021200111099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021200111141) 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 63 ways as a sum of consecutive naturals, for example, 22953697555 + ... + 22953707183.

It is an arithmetic number, because the mean of its divisors is an integer number (4985718964380).

Almost surely, 2^{221021200111101} is an apocalyptic number.

It is an amenable number.

221021200111101 is a deficient number, since it is larger than the sum of its proper divisors (98064813609219).

221021200111101 is a wasteful number, since it uses less digits than its factorization.

221021200111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13166.

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

Adding to 221021200111101 its reverse (101111002120122), we get a palindrome (322132202231223).

The spelling of 221021200111101 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred million, one hundred eleven thousand, one hundred one".