21222726163 has 2 divisors, whose sum is σ = 21222726164. Its totient is φ = 21222726162.

The previous prime is 21222726149. The next prime is 21222726179. The reversal of 21222726163 is 36162722212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222726163 - 2⁹ = 21222725651 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222726113) 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, 10611363081 + 10611363082.

It is an arithmetic number, because the mean of its divisors is an integer number (10611363082).

Almost surely, 2^21222726163 is an apocalyptic number.

21222726163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222726163 is an equidigital number, since it uses as much as digits as its factorization.

21222726163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The spelling of 21222726163 in words is "twenty-one billion, two hundred twenty-two million, seven hundred twenty-six thousand, one hundred sixty-three".