21220223111 has 2 divisors, whose sum is σ = 21220223112. Its totient is φ = 21220223110.

The previous prime is 21220223033. The next prime is 21220223147. The reversal of 21220223111 is 11132202212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220223111 - 2¹⁸ = 21219960967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220223111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220223161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610111555 + 10610111556.

It is an arithmetic number, because the mean of its divisors is an integer number (10610111556).

Almost surely, 2^21220223111 is an apocalyptic number.

21220223111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220223111 is an equidigital number, since it uses as much as digits as its factorization.

21220223111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21220223111 its reverse (11132202212), we get a palindrome (32352425323).

The spelling of 21220223111 in words is "twenty-one billion, two hundred twenty million, two hundred twenty-three thousand, one hundred eleven".