21222120100111 has 6 divisors (see below), whose sum is σ = 24686956034880. Its totient is φ = 18190388657196.

The previous prime is 21222120100109. The next prime is 21222120100123. The reversal of 21222120100111 is 11100102122212.

It is not a de Polignac number, because 21222120100111 - 2¹ = 21222120100109 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 (21222120100411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216552245871 + ... + 216552245968.

It is an arithmetic number, because the mean of its divisors is an integer number (4114492672480).

Almost surely, 2^{21222120100111} is an apocalyptic number.

21222120100111 is a deficient number, since it is larger than the sum of its proper divisors (3464835934769).

21222120100111 is an equidigital number, since it uses as much as digits as its factorization.

21222120100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433104491853 (or 433104491846 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21222120100111 its reverse (11100102122212), we get a palindrome (32322222222323).

The spelling of 21222120100111 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred thousand, one hundred eleven".