21220122111111 has 96 divisors (see below), whose sum is σ = 40202378611200. Its totient is φ = 10462925571840.

The previous prime is 21220122111109. The next prime is 21220122111119. The reversal of 21220122111111 is 11111122102212.

It is a happy number.

It is not a de Polignac number, because 21220122111111 - 2¹ = 21220122111109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220122111119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7762456 + ... + 10133901.

It is an arithmetic number, because the mean of its divisors is an integer number (418774777200).

Almost surely, 2^{21220122111111} is an apocalyptic number.

21220122111111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21220122111111 is a deficient number, since it is larger than the sum of its proper divisors (18982256500089).

21220122111111 is a wasteful number, since it uses less digits than its factorization.

21220122111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17896469 (or 17896466 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21220122111111 its reverse (11111122102212), we get a palindrome (32331244213323).

The spelling of 21220122111111 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, one hundred eleven thousand, one hundred eleven".