21220122223 has 2 divisors, whose sum is σ = 21220122224. Its totient is φ = 21220122222.

The previous prime is 21220122221. The next prime is 21220122227. The reversal of 21220122223 is 32222102212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220122223 - 2¹ = 21220122221 is a prime.

Together with 21220122221, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21220122223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220122221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610061111 + 10610061112.

It is an arithmetic number, because the mean of its divisors is an integer number (10610061112).

Almost surely, 2^21220122223 is an apocalyptic number.

21220122223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220122223 is an equidigital number, since it uses as much as digits as its factorization.

21220122223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21220122223 its reverse (32222102212), we get a palindrome (53442224435).

The spelling of 21220122223 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, two hundred twenty-three".