21222223855243 has 2 divisors, whose sum is σ = 21222223855244. Its totient is φ = 21222223855242.

The previous prime is 21222223855241. The next prime is 21222223855309. The reversal of 21222223855243 is 34255832222212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222223855243 - 2¹ = 21222223855241 is a prime.

Together with 21222223855241, 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 21222223855243.

It is not a weakly prime, because it can be changed into another prime (21222223855241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611111927621 + 10611111927622.

It is an arithmetic number, because the mean of its divisors is an integer number (10611111927622).

Almost surely, 2^{21222223855243} is an apocalyptic number.

21222223855243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222223855243 is an equidigital number, since it uses as much as digits as its factorization.

21222223855243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 921600, while the sum is 43.

The spelling of 21222223855243 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-three million, eight hundred fifty-five thousand, two hundred forty-three".