21220012220111 has 2 divisors, whose sum is σ = 21220012220112. Its totient is φ = 21220012220110.

The previous prime is 21220012220081. The next prime is 21220012220123. The reversal of 21220012220111 is 11102221002212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220012220111 - 2³⁴ = 21202832350927 is a prime.

It is a super-2 number, since 2×21220012220111² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21220012220111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220012220191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610006110055 + 10610006110056.

It is an arithmetic number, because the mean of its divisors is an integer number (10610006110056).

Almost surely, 2^{21220012220111} is an apocalyptic number.

21220012220111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220012220111 is an equidigital number, since it uses as much as digits as its factorization.

21220012220111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220012220111 its reverse (11102221002212), we get a palindrome (32322233222323).

The spelling of 21220012220111 in words is "twenty-one trillion, two hundred twenty billion, twelve million, two hundred twenty thousand, one hundred eleven".