21120222111 has 4 divisors (see below), whose sum is σ = 28160296152. Its totient is φ = 14080148072.

The previous prime is 21120222043. The next prime is 21120222133. The reversal of 21120222111 is 11122202112.

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 21120222111 - 2¹¹ = 21120220063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120222161) 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, 3520037016 + ... + 3520037021.

It is an arithmetic number, because the mean of its divisors is an integer number (7040074038).

Almost surely, 2^21120222111 is an apocalyptic number.

21120222111 is a deficient number, since it is larger than the sum of its proper divisors (7040074041).

21120222111 is an equidigital number, since it uses as much as digits as its factorization.

21120222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7040074040.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21120222111 its reverse (11122202112), we get a palindrome (32242424223).

The spelling of 21120222111 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-two thousand, one hundred eleven".