201021221201111 has 4 divisors (see below), whose sum is σ = 201655357545912. Its totient is φ = 200387084856312.

The previous prime is 201021221201089. The next prime is 201021221201167. The reversal of 201021221201111 is 111102122120102.

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 201021221201111 - 2¹⁰ = 201021221200087 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 201021221201111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021221201011) 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, 317068171925 + ... + 317068172558.

It is an arithmetic number, because the mean of its divisors is an integer number (50413839386478).

Almost surely, 2^{201021221201111} is an apocalyptic number.

201021221201111 is a deficient number, since it is larger than the sum of its proper divisors (634136344801).

201021221201111 is an equidigital number, since it uses as much as digits as its factorization.

201021221201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634136344800.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 201021221201111 its reverse (111102122120102), we get a palindrome (312123343321213).

The spelling of 201021221201111 in words is "two hundred one trillion, twenty-one billion, two hundred twenty-one million, two hundred one thousand, one hundred eleven".