21222236656163 has 2 divisors, whose sum is σ = 21222236656164. Its totient is φ = 21222236656162.

The previous prime is 21222236656129. The next prime is 21222236656169. The reversal of 21222236656163 is 36165663222212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222236656163 is a prime.

It is a super-2 number, since 2×21222236656163² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21222236656169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611118328081 + 10611118328082.

It is an arithmetic number, because the mean of its divisors is an integer number (10611118328082).

Almost surely, 2^{21222236656163} is an apocalyptic number.

21222236656163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222236656163 is an equidigital number, since it uses as much as digits as its factorization.

21222236656163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 47.

Adding to 21222236656163 its reverse (36165663222212), we get a palindrome (57387899878375).

The spelling of 21222236656163 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred thirty-six million, six hundred fifty-six thousand, one hundred sixty-three".