21112201202111 has 4 divisors (see below), whose sum is σ = 21458302861224. Its totient is φ = 20766099543000.

The previous prime is 21112201202101. The next prime is 21112201202123. The reversal of 21112201202111 is 11120210221112.

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 21112201202111 - 2¹⁰ = 21112201201087 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 21112201202111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112201202101) 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, 173050829465 + ... + 173050829586.

It is an arithmetic number, because the mean of its divisors is an integer number (5364575715306).

Almost surely, 2^{21112201202111} is an apocalyptic number.

21112201202111 is a deficient number, since it is larger than the sum of its proper divisors (346101659113).

21112201202111 is an equidigital number, since it uses as much as digits as its factorization.

21112201202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346101659112.

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

Adding to 21112201202111 its reverse (11120210221112), we get a palindrome (32232411423223).

The spelling of 21112201202111 in words is "twenty-one trillion, one hundred twelve billion, two hundred one million, two hundred two thousand, one hundred eleven".