21112244221111 has 12 divisors (see below), whose sum is σ = 21520971964240. Its totient is φ = 20711139583680.

The previous prime is 21112244221087. The next prime is 21112244221127. The reversal of 21112244221111 is 11112244221112.

It is not a de Polignac number, because 21112244221111 - 2⁷ = 21112244220983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112244221171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20741830 + ... + 21735868.

Almost surely, 2^{21112244221111} is an apocalyptic number.

21112244221111 is a deficient number, since it is larger than the sum of its proper divisors (408727743129).

21112244221111 is an frugal number, since it uses more digits than its factorization.

21112244221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001706 (or 1001653 counting only the distinct ones).

The product of its digits is 512, while the sum is 25.

Adding to 21112244221111 its reverse (11112244221112), we get a palindrome (32224488442223).

Subtracting from 21112244221111 its reverse (11112244221112), we obtain a palindrome (9999999999999).

The spelling of 21112244221111 in words is "twenty-one trillion, one hundred twelve billion, two hundred forty-four million, two hundred twenty-one thousand, one hundred eleven".