201221210221111 has 4 divisors (see below), whose sum is σ = 201257590846824. Its totient is φ = 201184829595400.

The previous prime is 201221210221091. The next prime is 201221210221133. The reversal of 201221210221111 is 111122012122102.

It is a happy number.

201221210221111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201221210221111 - 2⁵ = 201221210221079 is a prime.

It is a super-4 number, since 4×201221210221111⁴ (a number of 58 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221216221111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18190304560 + ... + 18190315621.

It is an arithmetic number, because the mean of its divisors is an integer number (50314397711706).

Almost surely, 2^{201221210221111} is an apocalyptic number.

201221210221111 is a deficient number, since it is larger than the sum of its proper divisors (36380625713).

201221210221111 is an equidigital number, since it uses as much as digits as its factorization.

201221210221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36380625712.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 201221210221111 its reverse (111122012122102), we get a palindrome (312343222343213).

The spelling of 201221210221111 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one hundred eleven".