21112122220211 has 4 divisors (see below), whose sum is σ = 23031406058424. Its totient is φ = 19192838382000.

The previous prime is 21112122220193. The next prime is 21112122220247. The reversal of 21112122220211 is 11202222121112.

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 21112122220211 - 2¹⁰ = 21112122219187 is a prime.

It is a super-2 number, since 2×21112122220211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112122223211) 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, 959641919090 + ... + 959641919111.

It is an arithmetic number, because the mean of its divisors is an integer number (5757851514606).

Almost surely, 2^{21112122220211} is an apocalyptic number.

21112122220211 is a deficient number, since it is larger than the sum of its proper divisors (1919283838213).

21112122220211 is a wasteful number, since it uses less digits than its factorization.

21112122220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919283838212.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21112122220211 its reverse (11202222121112), we get a palindrome (32314344341323).

Subtracting from 21112122220211 its reverse (11202222121112), we obtain a palindrome (9909900099099).

The spelling of 21112122220211 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, two hundred twenty thousand, two hundred eleven".