21222121010111 has 4 divisors (see below), whose sum is σ = 24253852582992. Its totient is φ = 18190389437232.

The previous prime is 21222121010081. The next prime is 21222121010171. The reversal of 21222121010111 is 11101012122212.

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 21222121010111 - 2¹⁴ = 21222120993727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222121010111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222121010171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515865786430 + ... + 1515865786443.

It is an arithmetic number, because the mean of its divisors is an integer number (6063463145748).

Almost surely, 2^{21222121010111} is an apocalyptic number.

21222121010111 is a deficient number, since it is larger than the sum of its proper divisors (3031731572881).

21222121010111 is an equidigital number, since it uses as much as digits as its factorization.

21222121010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031731572880.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21222121010111 its reverse (11101012122212), we get a palindrome (32323133132323).

The spelling of 21222121010111 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, ten thousand, one hundred eleven".